Abstract The article contains the results of research on transient heat and mass transfer processes occurring in a honey dehydrator with the capacity of 30 kg of honey with closed air circulation with volumetric flow rates V ˙ a = 0.01–0.03 m3s−1. The research was carried out different rotational speeds of the honey mixer ns = 120-270 rpm, without and with preheating of the honey. The article presents heat and mass balance equations for the considered process of honey dehydration, the values of heat transfer and mass transfer coefficients between honey and air were determined. The values obtained are respectively α = 5-25 Wm−2 K−1, β = 0.001–0.035 kg m−2s−1. The reduction of mixer speed from ns = 270 rpm to ns = 120 rpm was accompanied by an increase in average heat and mass transfer coefficients of approx. 30% and 52%, respectively. The tripled volumetric flow rate of air ( V ˙ a 1 / V ˙ a 2 = 3) resulted in an increase in heat and mass transfer coefficients – on average by 80% and 140%, respectively. Preheating the honey allows to increase the amount of removed water by 30%. The paper presents the general dimensionless expressions allowing for the calculation of heat and mass transfer coefficients.

中文翻译：

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密闭空气循环蜂蜜脱水机中的传热传质

摘要 本文包含对容量为 30 kg 蜂蜜的蜂蜜脱水机中发生的瞬态传热和传质过程的研究结果，该脱水机具有封闭的空气循环，体积流量 V ˙ a = 0.01–0.03 m3s−1。该研究是在蜂蜜搅拌机 ns = 120-270 rpm 的不同转速下进行的，没有和有蜂蜜预热。本文提出了所考虑的蜂蜜脱水过程的热量和质量平衡方程，确定了蜂蜜与空气之间的传热和传质系数值。获得的值分别为 α = 5-25 Wm-2 K-1, β = 0.001-0.035 kg m-2s-1。混合器速度从 ns = 270 rpm 降低到 ns = 120 rpm 伴随着平均传热和传质系数增加约 分别为 30% 和 52%。三倍的空气体积流量 (V ˙ a 1 / V ˙ a 2 = 3) 导致传热系数和传质系数增加——平均分别增加 80% 和 140%。预热蜂蜜可以将去除的水量增加 30%。本文介绍了用于计算传热和传质系数的通用无量纲表达式。