Abstract
Heat transfer characteristics of the countercurrent gas-solid flow inside verical pipes has been investigated with the shell and tube type heat exchanger. Sand particles having the average particle diameter of 1.0 and 1.7mm were used. The effect of gas velocity and sand paticle flow rate on the heat transfer rate and the pressure drop were examined. At room temperatures, the predicted pressure drop agrees well with the experimental results when the larger sand particles are used. The results shows that there exists an optimum sand particle flow rate at which the heat transfer rate become maximum. The increase in the heat transfer coefficient due to sand particles was obtained up to 62%.
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