The heat transfer measurement and numerical analysis for the compact dimple plate fins
| Autor: | Yang-ping Liu, 劉泱凭 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 This study examines the airside performance of heat sinks having fin patterns of plate fin, dimple vortex generator fin, cannelure fin, and dimple vortex generator with cannelure fin. In the previous investigations, although the dimple vortex generator fins to increase heat transfer performance, but it also has a relatively large pressure drop. Thus, they need a greater impetus to drive the fluid. The performance of heat transfer and pressure drop for a dimple plate fin should be better than before with new design. The purpose of this study is to optimize the number of dimples and their positions on the fins for better performance. The performance of fins is measured by the pressure differential instrumentation and thermal couples. Also, an infrared rays camera is used to take temperature distribution images on fins for analyzing the heat transfer performance for each fin. Also, EFD (Engineering Fluid Dynamics) software is used for simulating the temperature distribution on fins for comparing the experimental results. In this study, the fin spacing is equal to 1mm for reducing the density of the compact heat exchanger channel. The results indicated that the oblique dimple gap 6-12 cannelure fin type II has the best effective heat transfer than the other fin plates. Though, its pressure drop is not the smallest, but it has reduced approximately 12.9% pressure drops as compared to the oblique dimple gap 6-12 fin. In addition, it induces the lowest thermal resistance as compared to the other fins for the same pumping power. Using the principle for evaluation, it requires the smallest heat transfer area and can reduce 34% area as compared to the plate fin at wind speed about 1m/s~5m/s. While using the principle for evaluation, it needs the lowest operation power. As speed about 1m/s~5m/s, it reduces 56.38%of power as compared to the plate fin. From the above discussion, the oblique dimple gap 6-12 cannelure fin type II can reduce the most pumping power and increase the heat transfer rate, thus, it is the best choice for design to engineering applications. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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