Systematic Numerical Investigations on Heat Transfer Performance of Latticework Channel
Heat exchanger is an indispensable part in many fields such as aeronautic, astronautic, electronic device, energy and chemical industry. Due to the increasing heat flux, latticework channel featured with higher heat transfer rate is introduced and investigated. According to our best knowledge, there is no research data on the heat transfer characteristics under low Re for this structure up to now. Besides, current research hardly focus on the systematcial investigations on the key geometrical parameters of the latticework channel and it also ignores the effect of the solid thermal resistance (also termed as conjugate heat transfer analysis) which in fact, plays an important role in analyzing the heat transfer performance when comes to the system level. Therefore, the numerical investigations on conjugate heat transfer are carried out for the latticework channel, followed by a detailed optimization of flow and heat transfer performance where the Re is between 100 and 1000. Due to the characteristics of the structure, the longitudinal vortex can be generated and maintained naturally without the need for additional vortex generators, and continuous enhanced heat transfer is obtained. The Nusselt number can be enhanced to 3 ~ 10 times higher than that of the straight channel, which is much higher than that of the offset fin heat exchanger with the same hydraulic diameter. The effects of three geometric parameters on flow and heat transfer are also studied. It is found that reducing the rib width, reducing the number of inlet channels and maintaining AR = 1 are conducive to strengthening the heat transfer at low Re. The conjugate heat transfer is used to calculate the configurations of different rib widths. Due to the existence of solid thermal resistance, it is found that solid thermal conductivity holds significant influence on the heat transfer on the rib. In this article, we not only provide an systematical investigations on the geometrical study of the latticework channel via analyzing the coupling effect of the flow field with the heat transfer performance, but offer quantitatively analysis on the influence brough by the thermal resistance fo the ribs. Moreover, we offer clear guideline on designing heat exchangers employing the latticework channel which sheds light to a promising solution for compact heat exchanger with high heat flux
Year of publication: |
[2022]
|
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Authors: | Li, Li’ang ; Deng, Hongwu ; Li, Haiwang ; Huang, Yi |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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