Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 195, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2022.123168
Keywords
Microchannel heat sink; Flow boiling; Micro-pin-finned surfaces; Pressure drop; Hydrodynamic instability
Categories
Funding
- National Natural Science Foundation of China [51976163, U2141218]
- Key Research and Development Program in Shaanxi Province of China [2021GXLH-Z-076]
- Second Batch of Scientific Experiment Proposals Aboard China Space Station [TGMTYY00-JY-53-1.00]
- ESA-CMSA Joint Boiling Project [TGMTYY00-RW-05-1.00]
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This study investigates the pressure drop characteristics of flow boiling with deionized water on micro-pin-finned surfaces in a narrow microchannel. The results show that the mass flux has a significant effect on the pressure drop, while the increasing heat flux has almost no impact. Additionally, the micro-pin-finned surfaces (A30-120 and S30-120) exhibit lower pressure drop compared to the smooth surface, achieving more than a 30% reduction in pressure drop and thermal resistance.
In this work, flow boiling pressure drop characteristics based on the hydrodynamic instability with deionized water on the micro-pin-finned surfaces in a horizontal narrow microchannel with a hydraulic diameter of 952 mu m were investigated. The micro-pin-finned surfaces can be divided into three types based on the size and arrangement of the fins (A30-120/S30-120/A50-120). The experiments were conducted under the mass flux from 200 to 500 kg/m2s and the inlet temperature of 30 to 50 C. The two-phase flow patterns on the micro-pin-finned surfaces were captured by a high-speed camera. The flow boiling instabilities in the microchannel are studied, and the two-phase flow pattern, wall temperature, heat fluxes and mass fluxes as well as pressure drop are observed and analyzed. The experiment results show the mass flux has a significant effect on the pressure drop, while it has almost no change with the in-creasing heat flux in the microchannel heat sink during the nucleate boiling. Besides, the pressure drop of the A30-120 and S30-120 surfaces is less than that of smooth surface due to the effect of hydrophobic surface and bubble drag reduction. The maximum pressure drop of the A30-120 surface is only 0.970 kPa corresponding to the mass flux and critical heat flux (CHF) of 500 kg/m2s and 341.4 W/cm2 in this study, respectively. And the overall performance of the micro-pin-finned surfaces is also evaluated in the microchannel heat sink, which can achieve more than a 30% reduction in pressure drop and thermal resistance compared with the smooth surface. (C) 2022 Elsevier Ltd. All rights reserved.
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