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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental studies of adiabatic flow boiling in fractal-like branching microchannels
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Experimental studies of adiabatic flow boiling in fractal-like branching microchannels

机译：分形分支微通道中绝热沸腾的实验研究

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摘要

Experimental results of adiabatic boiling of water flowing through a fractal-like branching microchannel network are presented and compared to numerical model simulations. The goal is to assess the ability of current pressure loss models applied to a bifurcating flow geometry. The fractal-like branching channel network is based on channel length and width ratios between adjacent branching levels of 2~(-1/2). There are four branching sections for a total flow length of 18mm, a channel height of 150μm and a terminal channel width of 100μm. The channels were Deep Reactive Ion Etched (DRIE) into a silicon disk. A Pyrex disk was anodically bonded to the silicon to form the channel top to allow visualization of the flow within the channels. The flow rates ranged from 100 to 225g/min and the inlet subcooling levels varied from 0.5 to 6°C. Pressure drop along the flow network and time averaged void fraction in each branching level were measured for each of the test conditions. The measured pressure drop ranged from 20 to 90kPa, and the measured void fraction ranged from 0.3 to 0.9. The measured pressure drop results agree well with separated flow model predictions accounting for the varying flow geometry. The measured void fraction results followed the same trends as the model; however, the scatter in the experimental results is rather large.
机译：提出了流经分形分支微通道网络的绝热沸腾实验结果，并将其与数值模型仿真进行了比较。目的是评估应用于分流几何结构的当前压力损失模型的能力。分形的分支通道网络是基于相邻分支水平之间2〜（-1/2）之间的通道长度和宽度之比。有四个分支部分，总流动长度为18mm，通道高度为150μm，终端通道宽度为100μm。将通道进行深度反应离子刻蚀（DRIE）到硅盘中。将耐热玻璃盘阳极键合到硅上以形成通道顶部，以可视化通道内的流动。流速范围为100至225 g / min，入口过冷度为0.5至6°C。对于每种测试条件，均测量了沿流动网络的压降和每个分支级的时间平均空隙率。测得的压降为20至90kPa，测得的空隙率为0.3至0.9。测得的压降结果与考虑了不同流动几何形状的分离流动模型预测非常吻合。测得的空隙率结果遵循与模型相同的趋势;但是，实验结果中的分散性很大。

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