本文選題：堆積床 + 對流傳熱系數(shù)�。� 參考：《工程熱物理學(xué)報》2016年10期

【摘要】：本文采用萘升華熱質(zhì)比擬實驗方法測量了顆粒無序堆積床中顆粒流體之間的對流傳熱系數(shù)。文章首先針對堆積床中的"入口效應(yīng)"進(jìn)行了研究,發(fā)現(xiàn)入口處傳熱系數(shù)低于內(nèi)部傳熱系數(shù),其影響存在于幾個顆粒直徑范圍內(nèi),并在6~8倍顆粒直徑后達(dá)到傳熱充分發(fā)展區(qū)。其次對比了充分發(fā)展區(qū)的傳熱系數(shù)和Wakao公式的預(yù)測值,其平均偏差為11.83%。最后從孔隙率對傳熱的影響出發(fā),對Wakao公式的適用性進(jìn)行了探討。
[Abstract]:In this paper, the convection heat transfer coefficient between granular fluids in disordered granular piling bed is measured by using the method of naphthalene sublimation heat and mass analogy. In this paper, the "inlet effect" in the packed bed is studied. It is found that the heat transfer coefficient of the inlet is lower than that of the internal heat transfer coefficient, which exists in several particle diameter ranges, and reaches the full heat transfer development area when the particle diameter is 6 ~ 8 times. Secondly, the heat transfer coefficient of the fully developed area and the predicted value of the Wakao formula are compared, and the average deviation is 11.83. Finally, the applicability of Wakao formula is discussed based on the effect of porosity on heat transfer.
【作者單位】： 西安交通大學(xué)熱流科學(xué)與工程教育部重點實驗室;
【基金】：國家自然科學(xué)基金(No.51536007,No.51476124)
【分類號】：TK124

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本文編號：1953005