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An experimental study of gas-liquid flow in a narrow conduit

机译:狭窄管道中气液流动的实验研究

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This paper reports an experimental study of non-boiling air-water flows in a narrow conduit (diameter l.95 mm). Results are presented for pressure drop characteristics and for local heat transfer coefficients over a wide range of gas superficial velocity (0.l-50 m s~-1), liquid superficial velocity (0.08-0.5 m s~-1) and wall heat flux (3-58 kW m~-2). For a given liquid flow rate, the data exhibit sudden changes in pressure drop and, to a lesser extent, in heat transfer characteristics as the gas flow is increased. These events are believed to correspond to flow transitions, from bubbly, to intermittent slug, to annular flow. Overall, the pressure drops in these diabatic non-boiling two-phase flows can be estimated with good accuracy using correlations developed for adiabatic conditions. The heat transfer results are, on average, reasonably well described by the two-phase convective heat transfer components of flow- boiling correlations but there is considerable scatter in some cases.
机译:本文报道了在狭窄的管道(直径为1.95毫米)中非沸腾的空气水流的实验研究。给出了在气体表观速度(0.l-50 ms〜-1),液体表观速度(0.08-0.5 ms〜-1)和壁热通量(0)的宽范围内的压降特性和局部传热系数的结果。 3-58 kW m〜-2)。对于给定的液体流速,数据显示出随着气体流量的增加,压降突然下降,并且在较小程度上,传热特性出现变化。据信这些事件对应于从起泡到间歇弹塞到环形流动的流动过渡。总体而言,可以使用针对绝热条件开发的相关性,以较高的精度估算这些非绝热非沸腾两相流中的压降。平均而言,流-沸腾相关性的两相对流传热成分可以很好地描述传热结果,但在某些情况下会有很大的分散。

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