PDF(Pubmed)
Abstract：
Susceptibility of airborne ultrasonic power to augment heat and mass transfer during hot air dehydration of peppermint leaves was investigated in the present study. To predict the moisture removal curves, a unique non-equilibrium mathematical model was developed. For the samples dried at temperatures of 40‒70 °C and the power intensities of 0‒104 kW m-3, the diffusion of moisture inside the leaves and coefficients for of mass and heat transfer varied from 0.601 × 10-4 to 5.937 × 10-4 s-1, 4.693 × 10-4 to 7.975 × 10-4 m s-1 and 49.2 to 78.1 W m-2 K-1, respectively. In general, at the process temperatures up to 60 °C, all the studied transfer parameters were augmented in the presence of ultrasonic power.
摘要：
在本研究中，研究了气载超声功率对薄荷叶热空气脱水过程中传热和传质的敏感性。为了预测水分去除曲线，建立了一个独特的非平衡数学模型。对于在40-70°C的温度和0-104kWm-3的功率强度下干燥的样品，叶片内部水分的扩散以及传质和传热系数从0.601×10-4变化到5.937×10-4s-1、4.693×10-4至7.975×10-4ms-1和49.2至78.1Wm-2K-1。总的来说,在工艺温度高达60°C时，在存在超声功率的情况下，所有研究的传输参数都得到了增强。
