摘要
Heat and mass transfer of a circular-shaped porous moist object inside a two-dimensional triangle cavity is investigated by using finite element method.The porous object is considered to be a moist food sample,located in the middle of the cavity with inlet and outlet ports with different configurations of inlet/outlet ports.Convective drying performance is numerically assessed for different values of Reynolds numbers(between 50 and 250),dry air inlet temperature(between 40 and 80℃)and different locations of the port.It is observed that changing the port locations has significant impacts on the flow recirculaitons inside the triangular chamber while convective drying performance is highly affected.The moisture content reduces with longer time and for higher Reynolds number(Re)values.Case P4 where inlet and outlet ports are in the middle of the walls provides the most effective configuration in terms of convective drying performance while the worst case is seen for P1 case where inlet and outlet are closer to the corners of the chamber.There is a 192% difference between the moisture reduction of these two cases at Re=250,T=80℃ and t=120 min.
采用有限元方法研究了圆形多孔湿介质在二维三角形腔内的传热传质问题。所研究的多孔介质是一个潮湿的食品样品,位于配置不同位置的进口和出口的腔体的中间。对不同雷诺数(Re 50~250)、干风入口温度(40~80℃)和不同端口位置的对流干燥性能进行了数值模拟评价。结果表明,改变孔位对三角腔内的再循环有显著影响,对流干燥性能受到较大影响。随着时间的延长和雷诺数的增加,含水率减少。进口和出口端口位于壁面中间的P4情况具有最好的干燥性能,最差的情况是进口和出口更靠近腔室的角落P1情况。在Re=250、T=80℃、t=120 min时,两种材料的减湿量相差192%。
