Effect of Thermophysical Properties on Coupled Heat and Mass Transfer in Porous Material during Forced Convective Drying

Abstract

The convective drying kinetics of porous medium was investigated numerically. A mathematical model for forced convective drying was established to estimate the evolution of moisture content and temperature inside multilayered porous medium. The set of coupled partial differential equations with the specified boundary and initial conditions were solved numerically using a MATLAB code. An experimental setup of convective drying had been constructed and validated the theoretical model. The temperature and moisture content of the potato samples were dynamically measured and recorded during the drying process. Results indicate that thermal diffusion coefficient has significant positive impact on temperature distribution and mass diffusion coefficient might directly affect the moisture content distribution. Soret effect has a significant impact on heat flux and temperature distribution in the presence of large temperature gradient.

Experimental Investigation of Solar Greenhouse Drying of Hydroxide Sludge under Summer and Winter Climate

“…These results are confirmed by several previous studies [16]. However, there were no significant differences in In general, the open greenhouse is very dependent on weather conditions [16], [17], and this represents the main drawback of this type of greenhouse. On the other hand, the open greenhouse is the simplest, the most ecological and the least expensive solution compared to the closed greenhouse since it requires less equipment [17].…”

Convective drying of fruit: Role and impact of moisture transport properties in modelling

“…(2)) which is not accounted for in the wet bulb temperature predictions. Some modelling studies, which did not account for the latent heat of evaporation (Cai et al, 2014;Chandramohan, 2015;Esfahani et al, 2014), found a steadily increasing temperature without this initial temperature drop.…”

Análisis computacional de superficie de respuesta de la transferencia de masa durante la etapa de almacenamiento en la cadena de suministro del Ñame (Dioscorea rotundata)

“…La significancia del modelo (Valor-p) claramente es adecuada, debido a que posee un valor de cero (0), de igual forma, se evidencia que no existe una falta de ajuste, al ser este valor mayor al nivel de significancia preestablecido para el estudio. De forma complementaria, es de resaltar que el valor de la pendiente ( 0 ) para el modelo matemático obtenido con el nivel de temperatura de 35°C fue superior en comparación con los otros tratamientos suministrados, lo cual indica que el grado de inclinación de este modelo es mayor y por ende las estimaciones que se realicen con su empleo indicarán una mayor pérdida de peso durante el almacenamiento del ñame, lo cual es totalmente congruente con los fenómenos de transporte que indican que a mayor temperatura sobre las matrices vegetales porosas se obtendrá una mayor pérdida de peso hasta alcanzar el estado de equilibrio (Cai et al, 2015;Kumar et al, 2014;Perussello et al, 2014). De esta misma forma, una vez realizada la valoración teniendo en cuenta cada nivel de temperatura; se llevó a cabo una comparación similar, pero esta vez, se procedió a analizar la interacción derivada de la influencia de la temperatura de las condiciones ambientales dentro de cada nivel de tiempo de almacenamiento a través de un análisis de varianza, lo cual es congruente metodológicamente con los experimentos factoriales, lo resultados obtenidos se registran en la Tabla 4.…”