Flow boiling heat transfer characteristics on micro-pin-finned surfaces in a horizontal narrow microchannel

核沸腾 微通道 材料科学 临界热流密度 传热系数 热流密度 沸腾 传热 质量通量 水力直径 热力学 机械 湍流 物理 纳米技术 雷诺数
作者
Xiang Ma,Xinyu Ji,Jinyu Wang,Jiabin Fang,Yonghai Zhang,Jinjia Wei
出处
期刊:International Journal of Heat and Mass Transfer [Elsevier BV]
卷期号:194: 123071-123071 被引量:41
标识
DOI:10.1016/j.ijheatmasstransfer.2022.123071
摘要

In this paper, an experimental investigation of flow boiling in a horizontal narrow microchannel with hydraulic diameter of Dh = 952 μm was conducted. Flow boiling heat transfer characteristics of micro-pin-finned surfaces were evaluated over the mass fluxes range from 200 - 500 kg/m2s (corresponding flow velocity: 0.2 - 0.5 m/s), using deionized water as the working fluid with different inlet temperatures Tin = 30 - 50 °C. The outlet pressure of the microchannel was about 1 atm. The boiling curves, heat transfer coefficients, bubble behaviors and heat transfer enhancement mechanism were discussed with the variation of heat flux, mass flux and inlet temperature. The results indicated that the micro-pin-finned surfaces could improve the critical heat flux (CHF) and heat transfer coefficient (HTC) greatly due to numerous nucleate sites and large heat transfer area enhancement ratio. The CHF up to 360 W/cm2 has been demonstrated at a mass flux of 500 kg/m2s. Compared with a smooth surface, a 240% higher heat transfer coefficient (18.4 W/cm2K) on the S30-120 surface has been achieved at a mass flux of 500 kg/m2s with an inlet temperature of 30 °C. The boiling curves of the micro-pin-finned surfaces presented an obvious “hook back” phenomenon after reaching the onset of the nucleate boiling (ONB) and then the wall temperature had a slight rise with the increase of the heat flux. Moreover, the intensive micro-pin-finned arrangements showed a significant wicking effect and promoted liquid replenishment, which could destroy the liquid boundary and enhance turbulence. The bubble behaviors were also captured to explain the heat transfer enhancement mechanism in a horizontal narrow microchannel.
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