EP2687808A1 - Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom - Google Patents

Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom Download PDF

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Publication number
EP2687808A1
EP2687808A1 EP12176836.0A EP12176836A EP2687808A1 EP 2687808 A1 EP2687808 A1 EP 2687808A1 EP 12176836 A EP12176836 A EP 12176836A EP 2687808 A1 EP2687808 A1 EP 2687808A1
Authority
EP
European Patent Office
Prior art keywords
fluid
flow control
flow passage
fluid flow
fluid stream
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12176836.0A
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English (en)
French (fr)
Inventor
Andreas Wick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Operations GmbH
Original Assignee
Airbus Operations GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Airbus Operations GmbH filed Critical Airbus Operations GmbH
Priority to EP12176836.0A priority Critical patent/EP2687808A1/de
Priority to US13/938,812 priority patent/US20140020864A1/en
Priority to CN201310302880.3A priority patent/CN103575158B/zh
Publication of EP2687808A1 publication Critical patent/EP2687808A1/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0263—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by varying the geometry or cross-section of header box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0265—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by using guiding means or impingement means inside the header box
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element

Definitions

  • the invention relates to a homogenisation device, a heat exchanger assembly comprising a homogenisation device and a method of homogenising a temperature distribution in a fluid stream.
  • a fluid stream exiting a heat exchanger typically exhibits a temperature gradient across an exit face of the heat exchanger which might affect the accuracy of sensoric temperature measurements downstream of the heat exchanger. Further, the temperature gradient across the exit face of the heat exchanger might impede a partitioning of a main fluid stream exiting the heat exchanger into two or more partial fluid streams having substantially the same temperature.
  • the invention is directed at the object of providing a homogenisation device which allows a fast and reliable homogenisation of the temperature distribution in a fluid stream exiting a heat exchanger across an exit face of the heat exchanger without causing excessive pressure losses in the fluid stream. Further, the invention is directed at the object of providing a heat exchanger assembly comprising a homogenisation device of this kind. Finally, the invention is directed at the object of providing a method which allows a fast and reliable homogenisation of the temperature distribution in a fluid stream exiting a heat exchanger across an exit face of the heat exchanger without causing excessive pressure losses in the fluid stream.
  • a homogenisation device having the features of claim 1, a heat exchanger assembly having the features of claim 11 and a method of homogenising a temperature distribution in a fluid stream, the method having the features of claim 12.
  • the homogenisation device comprises a body with a fluid flow passage extending therethrough.
  • the body may, for example, at least partially be formed by a header of a heat exchanger, in particular a heat exchanger header which is disposed in the region of an exit of the heat exchanger.
  • the body at least partially may also be formed by a tube extending downstream of a heat exchanger exit.
  • the body comprises a first portion which is formed by a header of a heat exchanger and a second portion which is formed by a tube extending downstream of the heat exchanger.
  • the homogenisation device further comprises a flow control device which is disposed in the fluid flow passage passage.
  • the flow control device is configured to induce a swirl in an outer layer of a fluid stream flowing through the fluid flow passage, while the flow characteristics of a core layer of the fluid stream remain substantially unaffected by the flow control device.
  • the flow control device does not have to be configured so as to not affect the flow characteristics of the fluid stream core layer at all. Instead, it is, of course, conceivable that the flow control device, for example when the fluid stream passes a downstream region of the flow control device, does influence the fluid stream core layer.
  • the flow control device is configured to induce a swirl in the outer layer of the fluid stream, while simultaneously, at least for a certain period of time and/or at least along a certain length of the fluid flow passage, the flow characteristics of the fluid stream core layer remain unaffected by the flow control device.
  • the flow control device induces a rotational motion of the outer layer of the fluid stream relative to the core layer of the fluid stream.
  • the flow control device thus is particularly effective to homogenise the temperature distribution in a fluid stream exhibiting a temperature gradient across its cross section, i.e. a temperature gradient in a direction substantially perpendicular to the direction of flow of the fluid stream, since the regions of the fluid stream exhibiting the largest temperature differences, by the rotational motion of the outer layer of the fluid stream relative to the core layer of the fluid stream, are brought into close contact with each other.
  • the temperature differences in the core layer of the fluid are relatively low.
  • the fact that the flow control device, at least for a certain period of time and/or at least along a certain length of the fluid flow passage, does not substantially influence the flow characteristics of the fluid stream core layer does not substantially impair the homogenisation effect of the flow control device.
  • the configuration of the flow control device ensures that the pressure losses in the fluid stream caused by the homogenisation device are limited.
  • the homogenisation device thus allows a fast and reliable homogenisation of the temperature distribution in a fluid stream exhibiting a temperature gradient in a direction substantially perpendicular to the direction of flow of the fluid stream and hence is particularly suitable to homogenise a fluid stream exiting a heat exchanger. Simultaneously, the pressure losses in the fluid stream caused by the homogenisation device are particularly low.
  • the homogenisation device according to the invention is used to homogenise the temperature distribution in a fluid stream exiting a heat exchanger, the accuracy and reliability of sensoric measurements of the temperature of the fluid stream downstream of the heat exchanger can be improved. Further, in case the fluid stream, downstream of the heat exchanger, should be partitioned into two or more partial fluid streams, the homogenisation device ensures that the partial fluid streams have substantially the same temperature.
  • the flow control device preferably is disposed in the region of an inner wall of the fluid flow passage.
  • the flow control device may be attached to the inner wall of the fluid flow passage or be formed integral with the inner wall of the fluid flow passage.
  • the flow control device preferably is a static device, which does not comprise moveable elements.
  • a static flow control device does not require the presence of an external energy source for driving the flow control device.
  • the flow control device allows affecting the flow characteristics of the fluid stream flowing through the fluid flow passage, for example so as to homogenise a temperature distribution in the fluid stream, wherein the energy input required for affecting the flow characteristics of the fluid stream is taken from the fluid stream itself, resulting in a pressure decrease in the fluid stream.
  • the pressure losses in the fluid stream caused by the homogenisation device are limited
  • the flow control device is configured to cause the outer layer of the fluid stream to follow a coil-shaped fluid flow path along an inner wall of the fluid flow passage.
  • the flow control device may further be configured to induce coherent eddies in a buffer layer between the outer layer and the core layer of the fluid stream.
  • the configuration of the flow control device may cause coherent eddies to develop in a buffer layer between the outer layer and the core layer of the fluid stream after the period of time during which a swirl is induced in the outer layer of the fluid stream while the flow characteristics of the fluid stream core layer are not affected has passed or after the fluid stream has passed the length of the fluid flow passage along which a swirl is induced in the outer layer of the fluid stream while the flow characteristics of the fluid stream core layer are not affected.
  • Coherent eddies in a buffer layer between the outer layer and the core layer of the fluid stream may be induced by a flow control device which is configured to cause pressure differences in the fluid stream, specifically in a downstream region of the flow control device.
  • Coherent eddies in the buffer layer between the outer layer and the core layer of the fluid stream may also be induced when the flow control device causes the outer layer of the flow stream to follow a coil-shaped fluid flow path, whereas the core layer still follows a fluid flow path extending substantially along a longitudinal axis of the fluid flow passage or an angular speed of the swirl induced in the outer layer of the fluid stream is larger than an angular speed of a rotational motion of the core layer which may, for example, be the case in a downstream region of the flow control device.
  • the relative movement between the core layer and the outer layer induces an additional swirl in the buffer layer between the outer layer and the core layer and hence the development of coherent eddies in the buffer layer between the outer layer and the core layer.
  • the development of coherent eddies in the buffer layer between the outer layer and the core layer of the fluid stream further improves the homogenisation effect of the homogenisation device.
  • a diameter of the eddies reaches half the size of the diameter of the fluid flow passage resulting in an optimized homogenisation effect of the homogenisation device.
  • the fluid flow passage may comprise a first portion having a first flow section and a second portion having a second flow section which is smaller than the first flow cross section.
  • first portion of the fluid flow passed may be defined by a header of a heat exchanger and the second portion of the fluid flow passage may be defined by a tube extending downstream of a heat exchanger.
  • the flow control device of the homogenisation device may comprise at least one flow control blade extending from the inner wall of the fluid flow passage into the fluid flow passage.
  • the flow control blade may be attached to the inner wall of the fluid flow passage or may be formed integral with the inner wall of the fluid flow passage.
  • an inner edge region of the at least one flow control blade is arranged at a predetermined distance from a central axis of the fluid flow passage. This design of the flow control blade ensures that the core layer of the fluid stream flowing through the fluid flow passage, at least for a certain period of time and/or at least along a certain length of the fluid flow passage, remains Substantially unaffected by the flow control device although the flow control device induces a swirl in the outer layer of the fluid stream.
  • the flow control device may also comprise a plurality of flow control blades, for example four flow control blades, which are distributed along a circumference of the fluid flow passage.
  • the at least one flow control blade of the flow control device may be inclined relative to the inner wall of the fluid flow passage. Specifically, an angle defined between a first main surface of the flow control blade and the inner wall of the fluid flow passage may be smaller than 90° and an angle defined between a second main surface of the flow control blade and the inner wall of the fluid flow passage may be greater than 90°.
  • the main surfaces of the flow control blade may extend substantially parallel to a longitudinal axis of the fluid flow passage, i.e. substantially parallel to a direction of flow of the fluid stream flowing through the fluid flow passage upstream of the flow control device.
  • a flow control device comprising at least one inclined flow control blade is adapted to induce a swirl, i.e. a rotational motion in a layer of the fluid stream which is affected by the flow control device, such that the outer layer of the fluid stream follows a coil-shaped fluid flow path along the inner wall of the fluid flow passage.
  • the at least one flow control blade of the flow control device may be designed such that one of the main surfaces of the flow control blade is provided with a concave curvature.
  • the flow control blade is designed such that one of its main surfaces is provided with a concave curvature, whereas the other one of its main surfaces exhibits a convex curvature.
  • a curved flow control blade assists in the development of a swirl in a layer of the fluid stream affected by the flow control device.
  • the outer layer of the fluid stream In the region of a downstream end of the flow control device, the outer layer of the fluid stream increasingly interacts with the core layer causing the formation of eddies in the buffer layer between the outer layer and the core layer. Further, due to the above described design of the at least one flow control blade, pressure differences between the outer layer and the core layer of the fluid stream occur, in particular downstream of the flow control device, which assists in the development of coherent eddies in the buffer layer between the outer layer and the core layer of the fluid stream.
  • the at least one flow control blade of the flow control device may comprise a first portion disposed in the first portion of the fluid flow passage and a second portion disposed in the second portion of the fluid flow passage.
  • the design of the first and the second portion of the flow control blade is adapted to the flow cross section of the first and the second portion of the fluid flow passage.
  • the flow control blade preferably is designed such that an inner edge region of the first portion of the flow control blade and inner edge region of the second portion of the flow control blade are arranged at a substantially constant predetermined distance from the central axis of the fluid flow passage. This design of the flow control blade ensures that the core layer of the fluid stream flowing through the fluid passage remains substantially unaffected by the flow control device although the flow cross section of the second portion of the fluid flow passage is smaller than the flow cross section of the first portion of the fluid flow passage.
  • the flow control device of the homogenisation device may comprise a first coil-shaped groove provided in the region of the inner wall of the fluid flow passage.
  • the groove may be formed integral with the inner wall of the fluid flow passage or may be defined by a groove shaped component attached to the inner wall of the fluid flow passage.
  • a coil-shaped groove formed in the inner wall of the fluid flow passage induces a swirl, i.e. a rotational motion in the outer layer of the fluid stream flowing through the fluid flow passage, whereas a core layer of the fluid stream, at least for a certain period of time and/or at least along a certain length of the fluid flow passage, remains substantially unaffected.
  • the outer layer of the fluid stream upon flowing through the groove, follows a coil-shaped fluid flow path along the inner wall of the fluid flow passage. In the region of a downstream end of the groove, the outer layer increasingly interacts with the core layer causing the formation of eddies in the buffer layer between the outer layer and the core layer.
  • the flow control device may further comprise a second coil-shaped groove provided in the region of the inner wall of the fluid flow passage such that alternately a winding of the first coil-shaped groove and a winding of the second coil-shaped groove are provided in the region of the inner wall of the fluid flow passage.
  • An upstream end of the first coil-shaped groove may be disposed in a first region of the fluid flow passage which is adapted to be flown through with fluid having a first temperature and an upstream end of the second coil-shaped groove may be disposed in a second region of the fluid flow passage which is adapted to be flown through with fluid having a second temperature.
  • a flow control device comprising at least one coil-shaped groove preferably is disposed in the second portion of the fluid flow passage.
  • the coil-shaped groove may be disposed in the region of an inner wall of a tube extending downstream of a heat exchanger and having a circular cross section.
  • the flow control device of the homogenisation device may comprise either at least one flow control blade extending from the inner wall of the fluid flow passage or at least one coil-shaped groove provided in the region of the inner wall of the fluid flow passage. It is, however, also conceivable that the flow control device of the homogenisation device is provided with both, at least one flow control blade extending from the inner wall of the fluid flow passage and at least one coil-shaped groove provided in the region of the inner wall of the fluid flow passage. For example, at least one flow control blade of the flow control device may at least partially be disposed in a first portion of the fluid flow passage, and at least one coil-shaped groove of the flow control device may be formed in the inner wall of a second portion of the fluid flow passage.
  • a heat exchanger assembly according to the invention comprises at least one heat exchanger and a homogenisation device as described above.
  • the homogenisation device is disposed at an exit of the heat exchanger and serves to homogenise the temperature distribution in a fluid stream exiting the heat exchanger.
  • the homogenisation device may at least partially be integrated into the heat exchanger.
  • the flow control device of the homogenisation device may at least partially be disposed in a header of the exchanger.
  • a fluid stream is directed through a fluid passage extending through a body. Further, a swirl is induced in an outer layer of the fluid stream flowing through the fluid flow passage by means of a flow control device which is disposed in the fluid flow passage, while, at least for a certain period of time and/or at least along a certain length of the fluid flow passage, the flow characteristics of a core layer of the fluid stream remain unaffected by the flow control device.
  • the outer layer of the fluid stream is caused to follow a coil-shaped fluid flow path along an inner wall of the fluid flow passage.
  • coherent eddies are induced at in a buffer layer between the outer layer and the core layer of the fluid stream.
  • a homogenisation device, a heat exchanger assembly and/or a method of homogenising a temperature distribution in a fluid stream as described above are particularly suitable for use in an aircraft, in particular for homogenising the temperature distribution in a fluid stream exiting a heat exchanger installed on board the aircraft.
  • Figure 1 shows the temperature distribution in a fluid stream exiting a heat exchanger installed on board an aircraft.
  • the fluid stream exhibits a temperature gradient across an exit face of the heat exchanger, wherein this temperature gradient is substantially maintained when the fluid stream exits a header of the heat exchanger having a first flow cross section and enters a tube extending downstream of the heat exchanger and having a second flow cross section smaller than the first flow cross section of the heat exchanger header.
  • cold fluid prevails in a lower portion of the heat exchanger header and a lower portion of the tube extending downstream of the heat exchanger.
  • warm fluid prevails in an upper portion of the heat exchanger header and the tube extending downstream of the heat exchanger.
  • a central region of the fluid stream exhibits a medium temperature.
  • the fluid stream exiting the heat exchanger exhibits a temperature gradient across its cross section, i.e. in a direction substantially perpendicular to the direction of flow F of the fluid stream.
  • the homogenisation device 10 comprises a body 12 with fluid flow passage 14 extending therethrough.
  • the body 12 comprises a header 16 of a heat exchanger, in particular a header 16 arranged at exit of the heat exchanger.
  • the body 12 further comprises a tube 18 having a circular cross section and extending downstream of the heat exchanger header 16.
  • a direction of flow of the fluid stream exiting the heat exchanger and flowing through the fluid flow passage 14 in figure 2 is indicated by the arrow F.
  • the header 16 of the heat exchanger has a flow cross section that is larger than a flow cross section of the tube 18.
  • the fluid flow passage 14 extending through the body 12 comprises a first portion 14a which is defined by the header 16 and has a first flow cross section.
  • the fluid flow passage 14 comprises a second portion 14b which is defined by the tube 18 extending downstream of the heat exchanger header 16 and which has a second flow cross section smaller than the first flow cross section of the first portion 14a of the fluid flow passage 14.
  • the homogenisation device 10 further comprises a flow control device 20 which is disposed in the region of an inner wall 22 of the fluid flow passage 14.
  • the flow control device 20 comprises four flow control blades 24 extending from the inner wall 22 of the fluid flow passage 14.
  • the flow control blades 24 are distributed along a circumference of the fluid flow passage 14 and are inclined relative to the inner wall 22 of the fluid flow passage 14 such that an angle ⁇ defined by a first main surface 26 of the flow control blades 24 and the inner wall 22 of the fluid flow passage 14 is smaller than 90° and such that an angle ⁇ defined between a second main surface 28 of the flow control blades 24 and the inner wall 22 of the fluid flow passage 14 is greater than 90°.
  • the flow control blades 24 are designed such that their first main surface 26 is provided with convex curvature, whereas their second main surface 28 is provided with a concave curvature.
  • a first upstream portion of the flow control blades 24 is disposed within the first portion 14a of the fluid flow passage 14, i.e. extends from an inner wall of the header 16.
  • a second downstream portion of the flow control blades 24 is arranged in the second portion 14b of the fluid flow passage 14, i.e. extends from an inner wall of the tube 18.
  • An inner edge region 30 of the flow control blades 24, however, along the entire extension of the flow control blades 24 in the direction of flow F of the fluid stream flowing through the fluid flow passage 14, is arranged at a predetermined distance from a central axis A of the fluid flow passage 14.
  • the effect of the flow control device 20 on the flow characteristics of a fluid stream flowing through the fluid flow passage 14 is depicted in figure 3 .
  • the flow control blades 24 of the flow control device 20 induce a swirl S in an outer layer 32 of the fluid stream flowing through the fluid flow passage 14, i.e. a rotational motion of the outer layer 24 of the fluid stream relative to a core layer 34 of the fluid stream, see figure 3a .
  • Due to the rotational motion of the outer layer 32 of the fluid stream regions of the fluid stream having a high temperature are brought into close contact with regions of the fluid stream having a low temperature.
  • the temperature distribution across the cross section of the fluid stream as depicted in figure 1 is significantly homogenised.
  • the core layer 34 of the fluid stream upon passing an upstream portion of the flow control device 20, remains substantially unaffected by the flow control device 20.
  • the core layer 34 in an upstream region of the flow control device 20 thus, in general, has a direction of flow substantially parallel to the central axis A of the fluid flow passage 14.
  • an angular speed of the swirl S induced in the outer layer 32 of the fluid stream is larger than an angular speed of a rotational motion of the core layer34 which may, for example, develop when the fluid stream approaches a downstream region of the flow control device 20.
  • the outer layer 32 of the fluid stream flowing through the fluid passage 24 is caused to follow a coil-shaped fluid flow path along the inner wall 22 of the fluid flow passage 24.
  • a coil-shaped fluid flow path along the inner wall 22 of the fluid flow passage 14 is significantly longer without requiring the homogenisation device 10 to have larger dimensions and thus requiring a larger installation space. Nevertheless, homogenisation of the temperature distribution in the fluid stream may take place along the entire length of the coil-shaped fluid flow path such that a very effective homogenisation of the temperature distribution in the fluid stream may be achieved.
  • FIGS 4 and 5 show a second embodiment of a homogenisation device 10.
  • the homogenisation device 10 according to figures 4 and 5 differs from the arrangement according to figure 2 in that the flow control device 10 does no longer comprise flow control blades 24 extending from the inner wall 22 of the fluid flow passage 14, but a first and second coil-shaped groove 36, 38 formed in the inner wall 22 of the fluid flow passage 14.
  • An upstream end of the first groove 36 is disposed in a lower region of the fluid flow passage 14, i.e. in a region of the fluid flow passage 14 which is flown through with fluid having a low temperature.
  • An upstream end of the second groove 38 formed in the inner wall 22 of the fluid flow passage 14, by contrast, is arranged in an upper region of the fluid flow passage 14, i.e. in region of the fluid flow passage 14 which is flown through with fluid having a high temperature.
  • the grooves 36, 38 formed in the inner wall 22 of the fluid flow passage 14, like the flow control blades 24 of the flow control device 20 in the homogenisation device 10 according to figure 2 first induce a swirl S in the outer layer 32 of the fluid stream flowing through the fluid flow passage 14, whereas, upon passing an upstream region of the flow control device 20, the core layer 34 of the fluid stream remains substantially unaffected by the flow control device 20, see figure 6a . Due to the rotational motion of the outer layer 32 relative to the core layer 34 fluid having a low temperature is brought into close contact with fluid having a high temperature resulting in a homogenisation of the temperature distribution in the fluid stream flowing through the fluid flow passage 14. Simultaneously, pressure losses in the fluid stream caused by the flow control device 20 are minimized.
  • an angular speed of the swirl S induced in the outer layer 32 of the fluid stream is larger than an angular speed of a rotational motion of the core layer34 which may, for example, develop when the fluid stream approaches a downstream region of the flow control device 20.
  • the outer layer 32 of the fluid stream following a coil-shaped fluid flow path along the inner wall 22 of the fluid flow passage 14 thus acts as a kind of "roller bearing" for the core layer 34, resulting in a rotational motion of the fluid strands defines by the grooves 36, 38 about a central axis of the strands, wherein this rotational motion of the strands is maintained even downstream of the grooves 36, 38.
  • the relative movement between the outer layer 32 and the core layer 34 of the fluid stream induces coherent eddies in a buffer layer I between the outer layer 32 and the core layer 32 of the fluid stream, see figure 6b .
  • the core layer 34 of the fluid stream is involved in the turbulent flow characteristics induced by the flow control device 20.
  • the homogenisation effect of the homogenisation device 10 can further be enhanced.
  • FIG. 6 reveals that the temperature distribution in the fluid stream across the cross section of the fluid stream, i.e. in a direction substantially perpendicular to the general direction of flow F of the fluid stream is substantially homogenised.
  • the flow control device 20 comprises either flow control blades 24 or grooves 36, 38 formed in an inner wall 22 of the fluid flow passage 14. It is, however, also conceivable to provide a flow control device 20 with both, flow control blades 24 and at least one groove 36, 38 provided in the inner wall 22 of the fluid flow passage 14. Further, all features described above with reference to only one exemplary embodiments of the homogenisation device 10 can also be employed in another embodiment of the homogenisation device 10.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP12176836.0A 2012-07-18 2012-07-18 Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom Withdrawn EP2687808A1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP12176836.0A EP2687808A1 (de) 2012-07-18 2012-07-18 Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom
US13/938,812 US20140020864A1 (en) 2012-07-18 2013-07-10 Homogenisation device, heat exchanger assembly and method of homogenising a temperature distribution in a fluid stream
CN201310302880.3A CN103575158B (zh) 2012-07-18 2013-07-18 均化设备、热交换器组件及均化流体流中温度分布的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12176836.0A EP2687808A1 (de) 2012-07-18 2012-07-18 Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom

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EP2687808A1 true EP2687808A1 (de) 2014-01-22

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EP12176836.0A Withdrawn EP2687808A1 (de) 2012-07-18 2012-07-18 Homogenisierungsvorrichtung, Wärmetauscheranordnung und Verfahren zur Homogenisierung der Temperaturverteilung in einem Flüssigkeitsstrom

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US (1) US20140020864A1 (de)
EP (1) EP2687808A1 (de)
CN (1) CN103575158B (de)

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WO2016142760A1 (en) * 2015-03-06 2016-09-15 Ariston Thermo S.P.A. Air conveyor for heat pump
US10443623B2 (en) 2016-03-15 2019-10-15 Airbus Operations S.L. Heat exchanger outlet deflector

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DE102016109247B4 (de) * 2016-05-19 2020-03-26 Benteler Automobiltechnik Gmbh Abgaswärmeübertrager
EP3309494B1 (de) * 2016-10-13 2021-04-28 HS Marston Aerospace Limited Wärmetauscher
EP3348947B1 (de) * 2017-01-13 2020-11-04 HS Marston Aerospace Limited Wärmetauscher
CN112857127B (zh) * 2021-01-18 2022-05-31 中国神华煤制油化工有限公司 自清洗封头盖及换热设备

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