Microscale phase separation condensers with varied cross sections of each fluid phase: Heat transfer enhancement and pressure drop reduction
Microscale phase separation condensers with varied cross sections of each fluid phase: Heat transfer enhancement and pressure drop reduction
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每个流体相具有不同横截面的微型相分离冷凝器：增强传热和降低压降
DOI：
10.1016/j.ijheatmasstransfer.2017.11.002
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发表时间：
2018-03
影响因子：
5.2
通讯作者：
Wei Zhang
中科院分区：
文献类型：
--
作者：
Xiongjiang Yu;Jinliang Xu;Jindou Yuan;Wei Zhang
本文研究了一种基于相分离原理的微冷凝器。加衬的针翅阵列在芯片宽度方向上交替地产生液体通道和蒸气通道。气液界面前移导致吉布斯自由能降低是诱导液体从汽相通道向液相通道流动的机理。由于两相之间的界面面积减小而导致的能量耗散减小是压降减小的原因。研究了3种微冷凝器：微通道冷凝器（SWM）、平行相分离冷凝器（等截面PPS）和锥形相分离冷凝器（变截面CPS）。微型冷凝器具有25.0 mm × 3.0 mm的相同投影冷凝表面。腐蚀深度为75 μm。水蒸气是工作流体。与SWM相比，相分离冷凝器在相同的压降下提高了15%的质量流量。PPS冷凝器在中等或较小的冷却强度下强化了传热，但在大的冷凝液流量下传热恶化，此时会发生液体过度膨胀，淹没所有的针翅侧壁。CPS冷凝器自适应两相流量的变化，以稳定针翅膜附近的汽液界面。针形翅片面向蒸汽通道的侧壁被薄液膜覆盖，以消除过液体膨胀。CPS冷凝器在整个运行参数范围内强化传热，冷凝传热系数最大提高74%，同时压降降低。CPS冷凝器在三种冷凝器中性能最好。
Micro-condenser using the phase separation concept was investigated in this paper. Lined pin fin arrays generate liquid passages and vapor passages alternatively in chip width direction. The decreased Gibbs free energy with gas–liquid interface advancing pin fin throat location is the mechanism to induce liquid flow from vapor passages to liquid passages. The decreased energy dissipation due to decreased interfacial area between the two phases accounts for pressure drop reduction. Three micro-condensers were investigated: microchannel condenser (SWM), parallel phase separation condenser (PPS with constant cross sections of fluid passages) and conical phase separation condenser (CPS with varied cross sections of fluid passages). Micro-condensers had identical project condensation surface of 25.0 mm by 3.0 mm. The etched depth was 75 μm. Water-vapor was the working fluid. Compared with SWM, phase separation condensers increased mass flow rate by 15% at similar pressure drops. PPS condenser enhances heat transfer at moderate or smaller cooling intensity, but deteriorates heat transfer at large condensed liquid flow rate, at which over liquid expansion occurs to flood all pin fin side walls. CPS condenser self-adapts variations of flow rates of the two phases to stabilize vapor–liquid interface near pin fin membrane. Pin fin side walls facing vapor passage are covered by thin liquid film to eliminate over liquid expansion. CPS condenser enhances heat transfer over entire operating parameter ranges, increasing condensation heat transfer coefficients by 74% maximally while pressure drops are decreased. CPS condenser has the best performance among the three condensers.
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影响因子：
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作者：
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