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首页> 外文期刊>International Journal of Heat and Mass Transfer >Wall-to-bed Heat Transfer In Vertical Hydraulic Transport And In Particulate Fluidized Beds
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Wall-to-bed Heat Transfer In Vertical Hydraulic Transport And In Particulate Fluidized Beds

机译：垂直液压传输和颗粒流化床中的壁床传热

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摘要

Wall-to-bed heat transfer in hydraulic transport and in particulate fluidized beds of spherical particles was studied. Experiments were performed by spherical glass particles of 0.80-2.98 mm in diameter with water in a 25.4 mm I.D. cooper tube equipped with a steam jacket.rnIn the hydraulic transport runs the Reynolds number varied between 3300 and 20150 (particles of 1.20,1.94 and 2.98 mm in diameter), while in particulate fluidized beds Reynolds number varied between 1960 and 7850 (particles of 0.80,1.10 and 1.94 mm in diameter). The influence of different parameters as liquid velocity, particles size and voidage on heat transfer in fluidized beds and in hydraulic transport are presented.rnIn our hydraulic transport experiments, the two characteristic flow regimes were observed: "turbulent" and "parallel" flow. Our experimental data show that the heat transfer coefficients in "turbulent" regime are much higher then in "parallel" flow, and the heat transfer coefficients is generally higher while the flow is in fluidized bed.rnThe data for heat transfer in particulate fluidized beds and for vertical hydraulic transport were correlated treating the flowing fluid-particle mixture as a pseudo fluid. New correlation for heat transfer factor in fluidized beds and in vertical hydraulic transport is proposed.
机译：研究了水力运输和球形颗粒的颗粒流化床中的壁床传热。实验是用直径为0.80-2.98 mm的球形玻璃颗粒在25.4 mm I.D.的水中进行的。在液压输送过程中，雷诺数在3300和20150之间变化（直径为1.20、1.94和2.98毫米颗粒），而在颗粒流化床中，雷诺数在1960和7850之间变化（颗粒为0.80）直径，.1.10和1.94毫米）。提出了液体速度，颗粒大小和空隙率等不同参数对流化床和水力输送中的传热的影响。在我们的水力输送实验中，观察到了两个特征流态：“湍流”和“平行”流。我们的实验数据表明，“湍流”状态的传热系数要比“平行”流动的传热系数高，而在流化床中的传热系数通常更高。垂直水力运输的相关性将流动的流体-颗粒混合物视为假流体。提出了流化床和垂直水力输送中传热因子的新关联。

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