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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer in gas-solid fluidized bed with various heater inclinations
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Heat transfer in gas-solid fluidized bed with various heater inclinations

机译：具有不同加热器倾斜度的气固流化床中的传热

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摘要

The study explored the heat transfer properties in an air-fluidized bed of sand, heated with an immersed heat transfer tube positioned at several angles of inclination. Operating with fluidizing velocity up to 0.5 m/s; and particles of 150-350 urn diameter, the effect of air velocity and particle size on the average and maximum achieved heat transfer coefficient was examined for the heat transfer tube at angles of inclination in the range 0-90°. Experimental results showed that the angle of inclination altered the bubble size and behavior close to the heat transfer tube hence the expected heat transfer coefficient, with the influence of tube inclination being less pronounced for smaller particles. The optimum angle of inclination was in the range of 10-15° relative to the direction of the flow, while the heat transfer coefficient had its lowest values at the angle of 45°, and thereafter improved upon transition to 90°. Upon comparison with existing correlations, a correction factor is proposed to account for the impact of the angle of inclination on the heat transfer coefficient calculated by the Molerus-Wirth semi-empirical correlation.
机译：这项研究探索了在空气流化砂床上的传热特性，该砂床由位于几个倾斜角度的浸入式传热管加热。以高达0.5 m / s的流化速度运行；对于直径为150-350微米的颗粒，研究了风速和粒径对传热管在0-90°倾斜角下平均和最大传热系数的影响。实验结果表明，倾斜角改变了靠近传热管的气泡尺寸和性能，从而改变了预期的传热系数，而对于较小的颗粒，管的倾斜影响较小。相对于流动方向的最佳倾斜角度在10-15°的范围内，而热传递系数在45°的角度处具有最低值，此后在转变为90°时有所改善。与现有的相关性进行比较后，提出了一个校正因子，以说明倾斜角对由Molerus-Wirth半经验相关性计算出的传热系数的影响。

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