Effect of Wick Evaporation Area on Thermal Performance of Loop Heat Pipes
| Autor: | Jhih-Huang Gao, 高智皇 |
|---|---|
| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 101 This study investigates the effects of increasing the evaporating area of wick in a Loop Heat Pipe (LHP). This work attempts to improve the performance of the loop heat pipe by increasing the number of grooves and thereby the surface area of the wick. The number of grooves is increased from 0％(groove 8) to 100％(groove 16).Production results are limited that we cannot be successfully produced the wick structure of 16 grooves, so the thermal performance of the test and capillary structure parameters of testing only for groove 8 ~ groove 14. Experimental results show that increasing the number of grooves not only increases the surface area of the wick but also enhances LHP performance. When the evaporating surface area increases by 75％(groove 14),which corresponds to increasing the number of grooves from eight to fourteen, We can get most of the heat transfer performance, also the heat transfer capacity increases to 500W and enhance the heat transfer performance about 56%.( Wick capillary permeability): 1.3-3.25 ( )、(Effective pore size):1.9-2.5( )、(Porosity):63-67%. The rate of change of the capillary structure is tiny, also good production within the range suggested in the literature Produced by the simplicity and success rate, we recommend that the evaporation area is increased by 50％(A_12),thermal resistance is reduced to 0.17℃/W, The heat transfer raised to 470W,enhancethe heat transfer performance about 50%.Finally, According to the experimental results, proposed the evaporation area design and performance relational expression, and then the future can also provide designers reference. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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