CN104677937A - Positioning device for measuring natural convection heat transfer coefficient outside pipe - Google Patents
Positioning device for measuring natural convection heat transfer coefficient outside pipe Download PDFInfo
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- CN104677937A CN104677937A CN201510131175.0A CN201510131175A CN104677937A CN 104677937 A CN104677937 A CN 104677937A CN 201510131175 A CN201510131175 A CN 201510131175A CN 104677937 A CN104677937 A CN 104677937A
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Abstract
The invention relates to a positioning device for measuring a natural convection heat transfer coefficient outside a pipe; the device mainly comprises a positioning frame, the circular pipe and a positioning base; the positioning frame is fixed on the positioning base; the device further comprises a transverse beam and a step beam; the transverse beam and the step beam are fixed in the middles of the upper and lower bottom surfaces of the positioning frame; one end of the circular pipe is fixed together with the transverse beam; and the other end of the circular pipe is fixed together with the step beam. The device is simple and smart in design; the angle of the pipe is changed timely by adjusting the positions of the transverse beam and a clamping groove; and therefore, the convection heat transfer under different heat transfer coefficients can be strengthened; a natural convection heat transfer law can be obtained out by combining the device with natural convection heat transfer characteristics and a large-space natural convection criterion equation; and therefore, the device disclosed by the invention has the far-reaching significance in the aspects of strengthening the heat transfer and saving energy.
Description
Technical field
The invention belongs to augmentation of heat transfer and field of energy-saving technology, relate to a kind of measurement locating device, particularly the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube.
Background technology
At present, the method for the outer NATURAL CONVECTION COEFFICIENT OF HEAT of domestic and international measuring tube mainly numerical simulation and design multitube system two kinds of methods.
Numerical simulation is the heat transfer free convection utilizing the circular tube temperatures such as Fluent dummy level, temperature field data numerical simulation obtained and utilization matlab simulate the pure background Shearing interference fringes obtained and combine, obtain shear interference simulation striped during hot stable state, then simulation striped and experiment striped are compared, verify, thus draw about horizontal pipe heat transfer free convection more exact solution.The horizontal pipe diameter that the method adopts is 15.6mm, the long 400mm of test chamber horizontal direction, vertical direction height 1000mm, the stress and strain model in whole region is two parts, pipe near surface generates actual circle, adopts structured grid, and remainder adopts unstructured grid.The given constant temperature angle value in two ends, test chamber left and right and bottom, top is pressure entrance, pipe wall constant temperature wall, and remainder is symmetrical boundary condition, gets pipe right half part and simulates.
Design multitube system, is made up of main body system, electrical heating measuring system and temp measuring system three part, by laboratory from spatially cutting off for experiment body room and control survey room two parts.The method adopts 8 heating tubes simultaneously or heat respectively, and in 8 heating tubes, the thinnest heating tube diameter is 13mm, and long is 400mm, and the thickest heating tube is 86mm, and long is 2271mm, and the physical dimension of all the other heating tubes is uniformly distributed between.In experimental test procedures, different according to the physical dimension of heating tube, buried 4 ~ 8 thermopairs respectively underground, when reaching steady heat conduction condition, the input electric power of electric heater thinks the total amount of heat that experiment tube outwards sheds.
Based on above-mentioned measuring method, prior art discloses the multiple experimental provision about the outer NATURAL CONVECTION COEFFICIENT OF HEAT of measuring tube.
Application number be 200510046420.4 domesticly patent discloses a kind of large spatial outer tube natural convection experiment device, this device comprises outer tube hanger bracket, controls acquisition and analysis instrument and computing machine; Outer tube hanger bracket is rectangular parallelepiped framed structure, is to hang in two suspended cross-beam by two hanging silks by heating outer tube; Heating outer pipe surface sweating heat galvanic couple, thermopair connection control acquisition and analysis instrument, controls acquisition and analysis instrument and connects computing machine, realizes detection, computational analysis in real time, can study outer tube natural convection air HEAT TRANSFER LAW flexibly.
Application number be 201110352147.3 domesticly patent discloses a kind of radial heat pipe type large-space transverse pipe outer surface air natural convection heat transfer experiment.This device comprises isolation cabinet, electrical heating power control device, data collecting instrument, computing machine, adiabatic suspension silk, radial heat pipe and thermopair; Be provided with adiabatic suspension silk and 2 thermopairs in isolation cabinet, be provided with radial heat pipe in adiabatic suspension silk lower end; Data collecting instrument is connected with 5 thermopairs, and data collecting instrument is connected with computing machine, and electrical heating power control device is connected with electrically heated rod.
Horizontal tube heat exchange is adopted extensively to be carried out in natural convection air heat transfer technology.The pipeline used in prior art is all along a fixing level angle, and in measuring tube outer heat transfer free convection experiment, pipeline angle is constant all the time.But, change pipeline angle, can heat transfer criterion equations be changed, realize the strengthening of convection heat transfer under various heat exchange coefficient.Therefore, be badly in need of a kind of locating device that pipeline angle can be made in good time to change in the experiment of the outer heat transfer free convection of measuring tube of research and development, thus the strengthening of convection heat transfer under realizing various heat exchange coefficient.
Summary of the invention
Object of the present invention is just for above-mentioned the deficiencies in the prior art, provides the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube, and this locating device by changing pipe angle of inclination, and then changes the characteristic length of pipeline, reaches and changes convection current object.
The object of the invention is to be achieved through the following technical solutions, accompanying drawings is as follows:
A locating device for the outer NATURAL CONVECTION COEFFICIENT OF HEAT of measuring tube, form primarily of positioning framework 1, pipe 4 and positioning base 7, described positioning framework 1 is fixed on positioning base 7; The locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of described measuring tube also comprises crossbeam and Stepped Beam 3; Described crossbeam and Stepped Beam 3 are individually fixed in the middle part of the upper and lower bottom surface of positioning framework 1; Described pipe 4 one end and crossbeam are fixed, and the other end and Stepped Beam 3 are fixed.
Described positioning framework 1 is rectangular structure, is made up of 12 iron beams.
Described Stepped Beam 3 has the draw-in groove 6 of multiple corresponding different angles.
The angle of described draw-in groove 6 is 30 °, 45 ° or 60 °.
Described crossbeam has a hole 5, pipe 4 one end is fixed through hole 5 by cord 2; The other end of described pipe 4 is fixed in the draw-in groove 6 on Stepped Beam 3.
Beneficial effect of the present invention is simplicity of design, the exquisiteness of locating device; By the change pipeline angle regulating the position of crossbeam and draw-in groove in good time, the strengthening of convection heat transfer under various heat exchange coefficient can be realized; Combined with heat transfer free convection feature, large space natural convection criteria equation by this locating device, can arrange out the heat exchange rule of natural convection, heat conduction reinforced, there is far reaching significance economize energy aspect.
Accompanying drawing explanation
Fig. 1 is the structural representation of the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube of the present invention
Fig. 2 is the partial top view of Stepped Beam in the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube of the present invention
In figure, 1, positioning framework 2, cord 3, Stepped Beam 4, pipe 5, hole 6, draw-in groove 7, positioning base
Embodiment
Describe embodiments of the invention below in conjunction with accompanying drawing, but the present invention is not limited thereto:
As Figure 1-Figure 2, the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube, comprises positioning framework 1, Stepped Beam 3, pipe 4, crossbeam and positioning base 7; Described positioning framework 1 is fixed on positioning base 7; Described Stepped Beam 3 is fixed on positioning framework 1 bottom surface; Described crossbeam is fixed on the upper bottom surface of positioning framework 1; Described pipe 4 one end and crossbeam are fixed, and the other end and Stepped Beam 3 are fixed.
Described positioning framework 1 is rectangular structure, is made up of 12 iron beams.
Described Stepped Beam 3 has the draw-in groove 6 of multiple corresponding different angles.
The angle of described draw-in groove 6 is 30 °, 45 ° or 60 °.
Described crossbeam has a hole 5, pipe 4 one end is fixed through hole 5 by cord 2; The other end of described pipe 4 is fixed in the draw-in groove 6 on Stepped Beam 3.
In heat transfer free convection process, according to the requirement of work condition state and service condition, by changing pipeline angle, and then change the characteristic length of pipeline, reach change convection current, realize various heat exchange coefficient under the strengthening of convection heat transfer.
Concrete air flows through natural convection pipe, the pipe 4 namely in Fig. 1 as shown in Figure 1, and the electrical heating wire energising of pipe 4 makes tube wall heat up, after temperature stabilization with outside pipe, carry out convection heat transfer.Described pipe 4 is for fixing at two ends, and left end is connected with cord 2, and the upper end of cord 2 is through the crossbeam (not shown in FIG.) having hole 5, and right-hand member is fixed on and has on the Stepped Beam 3 of draw-in groove 6.Whole system is in positioning framework 1, and pipe 4 can be fixed on different angles by position accurately that simultaneously adjust cord 2 and draw-in groove 6.Pythagorean theorem in the Main Basis mathematics of pipeline angle meticulous location: the distance of cord 2 lower end distance Stepped Beam 3, the length of pipe 4, draw-in groove 6, apart from the distance form right angle triangle of cord 2 extended line, can meet angular relationship completely by calculating distance.Whole positioning framework 1 lower end is provided with positioning base 7, keeps the stable of experiment table.
As shown in Figure 2, three small rectangles are the vertical view of draw-in groove 6 on Stepped Beam 3, three draw-in grooves 6 are to the different angles in requisition for adjustment, 30 °, 45 ° and 60 ° respectively, position is drawn by the length computation of corresponding angle and pipe, draw-in groove 6 size according to pipe diameter determing, and carries out finishing, ensures that experiment tube does not shake and stablizes in draw-in groove 6 and is kept at an angle.
Claims (5)
1. the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of measuring tube, form primarily of positioning framework (1), pipe (4) and positioning base (7), described positioning framework (1) is fixed on positioning base (7), it is characterized in that: also comprise crossbeam and Stepped Beam (3); Described crossbeam and Stepped Beam (3) are individually fixed in the middle part of the upper and lower bottom surface of positioning framework (1); Described pipe (4) one end and crossbeam are fixed, and the other end and Stepped Beam (3) are fixed.
2. the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube according to claim 1, is characterized in that: described positioning framework (1) is rectangular structure, is made up of 12 iron beams.
3. the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube according to claim 1, is characterized in that: the draw-in groove (6) described Stepped Beam (3) having multiple corresponding different angles.
4. the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube according to claim 3, is characterized in that: the angle of described draw-in groove (6) is 30 °, 45 ° or 60 °.
5. according to the locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube in Claims 1 to 4 described in any one, it is characterized in that: described crossbeam has a hole (5), pipe (4) one end is fixed through hole (5) by cord (2); The other end of described pipe (4) is fixed in the draw-in groove (6) on Stepped Beam (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510131175.0A CN104677937A (en) | 2015-03-24 | 2015-03-24 | Positioning device for measuring natural convection heat transfer coefficient outside pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510131175.0A CN104677937A (en) | 2015-03-24 | 2015-03-24 | Positioning device for measuring natural convection heat transfer coefficient outside pipe |
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| CN104677937A true CN104677937A (en) | 2015-06-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174654A (en) * | 1992-03-18 | 1992-12-29 | Droege Thomas F | Heat exchanger efficiency monitor |
| CN1696678A (en) * | 2005-05-16 | 2005-11-16 | 鞍山科技大学 | Experimental apparatus of natural-convection heat transfer for air outside large spatial outer tube |
| KR20110015258A (en) * | 2009-08-07 | 2011-02-15 | 한국전력공사 | Method and system for inspecting creep and thinned damage in heat exchanger steam tube |
| CN102520006A (en) * | 2011-11-09 | 2012-06-27 | 浙江大学 | Radial heat pipe type large-space transverse pipe outer surface air natural convection heat transfer experiment device |
| CN204630962U (en) * | 2015-03-24 | 2015-09-09 | 吉林大学 | The locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube |
-
2015
- 2015-03-24 CN CN201510131175.0A patent/CN104677937A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5174654A (en) * | 1992-03-18 | 1992-12-29 | Droege Thomas F | Heat exchanger efficiency monitor |
| CN1696678A (en) * | 2005-05-16 | 2005-11-16 | 鞍山科技大学 | Experimental apparatus of natural-convection heat transfer for air outside large spatial outer tube |
| KR20110015258A (en) * | 2009-08-07 | 2011-02-15 | 한국전력공사 | Method and system for inspecting creep and thinned damage in heat exchanger steam tube |
| CN102520006A (en) * | 2011-11-09 | 2012-06-27 | 浙江大学 | Radial heat pipe type large-space transverse pipe outer surface air natural convection heat transfer experiment device |
| CN204630962U (en) * | 2015-03-24 | 2015-09-09 | 吉林大学 | The locating device of the outer NATURAL CONVECTION COEFFICIENT OF HEAT of a kind of measuring tube |
Non-Patent Citations (2)
| Title |
|---|
| DEVANAHALLI G. PRABHANJAN ET AL.: ""Natural convection heat transfer from helical coiled tubes"", 《INTERNATIONAL JOURNAL OF THERMAL SCIENCES》 * |
| 李文博 等: ""沿不同位置圆管自然对流换热系数的测定及准则方程的验证"", 《高等学校工程物理第二十届全国学术论文文集——传热传质学专辑》 * |
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Application publication date: 20150603 |