WO1991018254A1 - Appareil pour renforcer le transfert de chaleur entre une surface plane d'un corps et un gaz environnant - Google Patents

Appareil pour renforcer le transfert de chaleur entre une surface plane d'un corps et un gaz environnant Download PDF

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Publication number
WO1991018254A1
WO1991018254A1 PCT/SE1991/000351 SE9100351W WO9118254A1 WO 1991018254 A1 WO1991018254 A1 WO 1991018254A1 SE 9100351 W SE9100351 W SE 9100351W WO 9118254 A1 WO9118254 A1 WO 9118254A1
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WO
WIPO (PCT)
Prior art keywords
heat transfer
resonators
resonator
transfer zone
low frequency
Prior art date
Application number
PCT/SE1991/000351
Other languages
English (en)
Inventor
Roland Sandström
Mats Olsson
Original Assignee
Infrasonik Ab
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 Infrasonik Ab filed Critical Infrasonik Ab
Publication of WO1991018254A1 publication Critical patent/WO1991018254A1/fr

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Classifications

    • 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
    • F28F13/10—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by imparting a pulsating motion to the flow, e.g. by sonic vibration

Definitions

  • the invention relates to an apparatus for enforced heat transfer between a body, solid or liquid and with a substantially plane surface, and a surrounding gas. This is achieved by submitting the gas to the influence of low frequency sound which enhances the heat transfer between the body and the surrounding gas.
  • an apparatus for the cooling of steel strip is described.
  • the invention as presented herein is a further development of the previously known technique and it is particularly well adapted for the cooling of steel strip, but may also be used for other products or processes.
  • an enforced heat transfer between a body, solid or liquid, and a gas is achieved by means of a low frequency standing sound wave being generated in one or several sound resonators.
  • low frequency sound is understood sound of a frequency of 50 Hz or lower.
  • frequencies of above 50 Hz is less interesting is that a closed tubular resonator of the half-wave type will have such small dimensions at higher frequencies that the apparatus will be uninteresting from a capacity point of view.
  • sound of lower frequencies is less disturbing to the human being it is preferable to use sound of a frequency of 30 Hz or lower.
  • the sound resonator is by preference of a length corresponding to half the wavelength of the generated low frequency sound, but other designs of the sound resonator are also conceivable, such as an open resonator of a length corresponding to a quarter of the wave length of the generated sound.
  • the standing sound wave is maintained by air pulses generated by a special feeder unit, also called exigator or pulsator.
  • the pulsator is an apparatus of special design and it refers to that part of a low frequency sound generator which feeds air pulses to a resonator at or close to a sound pressure anti-node in said resonator. As an example reference is being made to Swedish patent No.
  • the heat emitted by the body in the resonator may be transported away either by means of a steady air-flow flowing through the resonator or by means of cooling the walls of the resonator.
  • the walls of the resonator may be cooled on the outside by water and the heat transferred from the air inside the resonator to the walls is then also enhanced by the low frequency sound in the same way as the heat transfer from the body to the air. In that case it w not be necessary to have an additional steady air-flow through the resonator.
  • Fig. 1 shows a explanatory sketch of an apparatus for enforced heat transfer by means of low frequency sound
  • Fig. 2 shows a schematic view of one embodiment of the heat transfer zone
  • Fig. 3 shows a schematic view of another embodiment of the heat transfer zone
  • Fig. 4 shows a schematic view of third embodiment of the heat transfer zone
  • Fig. 5 shows a schematic view of a fourth embodiment of the heat transfer zone
  • Fig. 6 shows a schematic view of fifth embodiment of the heat transfer zone.
  • low frequency sound is generated by one or several low frequency sound generators.
  • the low frequency sound generator consists of two parts, a pulsator part 1 and a resonator part 2.
  • the resonator comprises two tubular resonators of a lenght corresponding to a quarter of the wave length of the generated sound. Their respective open ends, which is where the heat transfer zone 3 is located, are facing each other at a close distance and are more or less connected in order to create a closed system. At the other end of the respective resonator, i. e. the closed end, the pulsator part is mounted.
  • the pulsator part may consist of two synchronized pulsators, one for each resonator, or only one pulsator of a special design which may service both resonator at the same time.
  • An example of such a pulsator is described in Swedish patent application No. 9001768-2.
  • the pulsator works to create a standing low frequency sound wave inside each resonator.
  • A, 9001768-2 which generates standing sound waves whose oscillations are of alternating directions in the two resonators, a common standing sound wave is generated having a particle velocity anti-node where the two resonators are connected, which is also where the heat transfer zone is located.
  • the two quarter-wave resonators thereby functions as a resonator of the half-wave type having the same natural frequency as each one of the two quarter-wave resonators.
  • the apparatus is an acoustically virtually closed system.
  • Fig. 2 shows a first embodiment of the heat transfer zone.
  • it is a cooling zone, for instance for the cooling of steel strip.
  • a pressurized cooling gas is fed to chambers 10, 11 on the outside of the resonator walls and from these chambers the cooling gas is fed into the resonator under high pressure by means of nozzles 12 penetrating the resonator walls.
  • the cooling gas will then be evacuated from the resonator through air outlets in the resonator walls outside the heat transfer zone.
  • the chambers with cooling gas will also have the additional beneficiary effect of cooling the resonator walls in the heat tranmission zone.
  • a cooling agent be evaporated to the cooling gas of the resonators in the cooling zone or a liquid cooling agent may be added in the cooling zone, for example in the form of being sprayed onto the steel strip, either from above, below, the side or from several directions at the same time.
  • Fig. 3 shows another, preferred embodiment of the heat transfer zone with a different solution regarding how to improve cooling.
  • the steel strip 23 is fed through the cooling zone through minimal openings situated in the walls of the resonators while the resonator walls are cooled by a circulating cooling agent 20.
  • the cooling agent is then transported away, for example to a heat exchanger.
  • turbuiators may consist of nail-shaped objects 30 mounted in the walls 31 , 32 of the resonators at an equal distance from the o
  • FIG. 5 Another means for creating turbulence is shown in Fig. 5.
  • the walls 34, 35 of the resonators in the heat transfer zone with the body 36 are made with a special profile, preferably a corrugated profile or a profile which is wave shaped along the longitudinal axis of the resonators.
  • Fig. 6 is shown another special design of the resonators in the heat transfer zone.
  • a high particle velocity is desired.
  • a maximum of the particle velocity is attained at the openings of the respective resonator, i.e. where they are connected and where the heat transfer zone is situated. If an even higher particle velocity is desired, one way to achieve this is by decreasing the cross section area of the resonators 37, 38 in the heat transfer zone, i.e. at their openings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

Appareil servant à renforcer le transfert de chaleur au moyen d'une onde acoustique à basse fréquence entre un corps, solide ou liquide, ayant une surface sensiblement plane, et un gaz environnant. L'appareil comporte une partie résonateur (2) et une partie générateur d'impulsion servant à générer une onde acoustique constante à basse fréquence dans la partie résonateur. La partie résonateur comprend deux résonateurs tubulaires qui ont la même fréquence naturelle et qui, du point de vue acoustique, forment un résonateur commun ayant la même fréquence naturelle que les deux résonateurs. Les résonateurs ont chacun une extrémité ouverte. Ces extrémités ouvertes sont disposées l'une en face de l'autre à courte distance et sont en communication l'une avec l'autre par l'intermédiaire de la zone de transfert de chaleur (3). Le corps est transporté dans la zone de transfert de chaleur par l'intermédiaire d'ouvertures ménagées dans les résonateurs.
PCT/SE1991/000351 1990-05-16 1991-05-16 Appareil pour renforcer le transfert de chaleur entre une surface plane d'un corps et un gaz environnant WO1991018254A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9001767-4 1990-05-16
SE9001767A SE9001767D0 (sv) 1990-05-16 1990-05-16 Metod och anordning foer forcerad vaermetransmission mellan en plan yta av en kropp och omgivande gas

Publications (1)

Publication Number Publication Date
WO1991018254A1 true WO1991018254A1 (fr) 1991-11-28

Family

ID=20379506

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000351 WO1991018254A1 (fr) 1990-05-16 1991-05-16 Appareil pour renforcer le transfert de chaleur entre une surface plane d'un corps et un gaz environnant

Country Status (2)

Country Link
SE (1) SE9001767D0 (fr)
WO (1) WO1991018254A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019245418A1 (fr) 2018-06-21 2019-12-26 Mats Olsson Procédé et système de refroidissement d'objets chauds
WO2019243423A1 (fr) * 2018-06-21 2019-12-26 Gestamp Hardtech Ab Procédé et système pour refroidir des pièces chaudes
WO2021123212A1 (fr) * 2019-12-20 2021-06-24 Gestamp Hardtech Ab Procédé et appareil de refroidissement d'objets chauds
WO2021123225A1 (fr) * 2019-12-20 2021-06-24 Gestamp Hardtech Ab Procédé et chaîne de production pour la formation d'objets

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256119A (en) * 1965-04-20 1966-06-14 George W Jernstedt Method of annealing steel strip
WO1990001466A1 (fr) * 1988-08-12 1990-02-22 Harry Ericsson Procede et dispositif de fusion d'un materiau fusible

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256119A (en) * 1965-04-20 1966-06-14 George W Jernstedt Method of annealing steel strip
WO1990001466A1 (fr) * 1988-08-12 1990-02-22 Harry Ericsson Procede et dispositif de fusion d'un materiau fusible

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019245418A1 (fr) 2018-06-21 2019-12-26 Mats Olsson Procédé et système de refroidissement d'objets chauds
WO2019243423A1 (fr) * 2018-06-21 2019-12-26 Gestamp Hardtech Ab Procédé et système pour refroidir des pièces chaudes
CN112262220A (zh) * 2018-06-21 2021-01-22 耶斯塔姆普硬技术股份公司 用于冷却热构件的方法和系统
EP3810351A4 (fr) * 2018-06-21 2021-05-19 Mats Olsson Procédé et système de refroidissement d'objets chauds
US20210277493A1 (en) * 2018-06-21 2021-09-09 Mats Olsson Method and system for cooling hot objects
US11261502B2 (en) 2018-06-21 2022-03-01 Gestamp Hardtech Ab Method and system for cooling hot components
WO2021123212A1 (fr) * 2019-12-20 2021-06-24 Gestamp Hardtech Ab Procédé et appareil de refroidissement d'objets chauds
WO2021123225A1 (fr) * 2019-12-20 2021-06-24 Gestamp Hardtech Ab Procédé et chaîne de production pour la formation d'objets
CN114929905A (zh) * 2019-12-20 2022-08-19 昂登坦汽车工程有限责任公司 工艺方法和用于形成物件的产品线
CN115244193A (zh) * 2019-12-20 2022-10-25 昂登坦汽车工程有限责任公司 用于冷却热物体的方法和装置
US20230026647A1 (en) * 2019-12-20 2023-01-26 Autotech Engineering S.L. Process and production line for forming objects

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Publication number Publication date
SE9001767D0 (sv) 1990-05-16

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