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首页> 外文期刊>International Journal of Heat and Mass Transfer >Bias effects on heat transfer measurements in microchannel flows
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Bias effects on heat transfer measurements in microchannel flows

机译：偏差对微通道流中传热测量的影响

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This work is devoted to both experimental and numerical investigations of the hydrodynamics and associated heat transfer in two-dimensional microchannels from 700 μm to 200 μm in height. The design of the test section enabled to vary the channel height and to set a quasi-constant heat flux at the microchannel surface. Laminar developing, transitional and turbulent regimes of water flows were explored (200 < Re < 8000). A significant decrease in the Nusselt number was observed in the laminar regime when the channel spacing was decreased while the Poiseuille number remained unchanged in regard to conventional channel flow. It is shown that a bias effect in the solid/fluid interface temperature measurements is most likely responsible for this scale effect. The temperature error was estimated and accounted for in the determination of the Nusselt number. The corrected values have been found to be consistent with the conventional laws both in the laminar and in the beginning of the turbulent regime.
机译：这项工作致力于在700μm至200μm高的二维微通道中进行流体动力学和相关传热的实验和数值研究。测试部分的设计能够改变通道高度，并在微通道表面设置准恒定的热通量。探索了水流的层流发育，过渡和湍流状态（200

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