Flow boiling with microchannel can dissipate high heat fluxes at low surface temperature difference. A number of issues, such as instabilities, low critical heat flux (CHF) and low heat transfer coefficients, have prevented it from reaching its full potential. A new design incorporating open microchannels with uniform and tapered manifold (OMM) was shown to mitigate these issues successfully. Distilled, degassed water at 80 mL/min is used as the working fluid. Plain and open microchannel surfaces are used as the test sections. Heat transfer and pressure drop performance for uniform and tapered manifold with both the surfaces are discussed. A low pressure drop of 7.5 kPa is obtained with tapered manifold and microchannel chip at a heat flux of 263 W/cm~2 without reaching CHF. The pressure drop data is further compared with the homogenous model and the initial results are presented.
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机译：微通道沸腾可以在低表面温差下消散高热通量。许多问题（例如不稳定，低临界热通量（CHF）和低热传递系数）阻止了其发挥其全部潜力。显示了将开放式微通道与均匀且锥形的歧管（OMM）结合在一起的新设计可以成功缓解这些问题。以80 mL / min的速度进行蒸馏，脱气的水用作工作流体。平坦和开放的微通道表面用作测试部分。讨论了两个表面均一和锥形的歧管的传热和压降性能。使用锥形歧管和微通道芯片在263 W / cm〜2的热通量下获得的7.5 kPa低压降没有达到CHF。进一步将压降数据与均质模型进行比较，并给出了初始结果。
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