scholarly journals Numerical Comparison of Triangular and Sinusoidal External Vibration Effects on the 3D Porous Drying Process

2020 ◽  
Vol 10 (2) ◽  
pp. 5554-5560
Author(s):  
N. Ben Khedher ◽  
R. Ramzi ◽  
I. A. Alatawi
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Control Volume ◽  
Saturation Pressure ◽  
Three Dimensional ◽  
Mass Transfer Process ◽  
Numerical Comparison ◽  
Drying Process ◽  
External Vibration

Drying is one of the most energy-intensive industrial processes. One of the techniques aiming to reduce energy consumption is the vibration technique which is generally employed to intensify the heat and mass transfer process. In this respect, this paper presents a three-dimensional numerical model to study the external vibration effects on the drying process of a porous medium. The model is based on a comparison of heat and mass transfer phenomena that arise during vibrating drying of unsaturated porous medium for two cases: triangular and sinusoidal external vibrations. The three-dimensional unstructured Control Volume Finite Element Method (CVFEM) is employed to simulate the vibrating drying. Numerical results of the time evolution of temperature, liquid saturation, pressure, and water content are compared and analyzed for the two cases.

Simulation of volumetric heating of a moist medium with allowance for fluid mobility

2012 ◽  
Vol 9 (1) ◽  
pp. 91-93
Author(s):  
U.R. Ilyasov ◽  
A.V. Dolgushev
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Numerical Solution ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Thermal Action ◽  
Mass Transfer Process ◽  
Low Permeability ◽  
Volumetric Heating ◽  
Drying Regime

The problem of volumetric thermal action on a moist porous medium is considered. Numerical solution, the influence of fluid mobility on the dynamics of the heat and mass transfer process is analyzed. It is established that fluid mobility leads to a softer drying regime. It is shown that in low-permeability media, the fluid can be assumed to be stationary.

Numerical analysis of 3D heat and mass transfer in cocoa beans under a solar drying condition with a thermal storage material

2021 ◽  
pp. 1-8
Author(s):  
Clement A. Komolafe ◽  
M. Adekojo Waheed ◽  
Chidozie Ezekwem ◽  
Ching-Lik Hii
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Heat And Mass Transfer ◽  
Three Dimensional ◽  
Thermal Storage ◽  
Cocoa Bean ◽  
Solar Drying ◽  
Drying Process ◽  
Storage Material ◽  
Cocoa Beans

Abstract This study investigated the numerical analysis of heat and mass transfer during solar drying of cocoa beans with firebrick thermal storage material (FTSM). The continuity, momentum, energy, and species equations were solved for a three-dimensional ellipsoidal cocoa-bean using the Finite Volume Method with the aid of ANSYS, a Computational Fluid Dynamics software. The simulated and experimental maximum product (Cocoa) temperatures of 53 and 53.5 °C respectively were in agreement with each other. The results obtained in this study will help the stakeholders in the cooa processing industries in the design of the drying system, selection of suitable drying conditions, and prediction of heat and mass transfer in the drying process of cocoa, enhancement of better quality attributes such as colour and flavour, reduction in the cost of design and time in the drying process.

scholarly journals Analysis of heat and mass transfer mechanism of vacuum freeze-drying in the primary drying

2007 ◽  
Vol 3 (2) ◽  
pp. 183-191
Author(s):  
Hua Li ◽  
Lihua Li ◽  
Xingli Jiao ◽  
Xueli Qin
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Present Status ◽  
Freeze Drying ◽  
Mass Transfer Process ◽  
Transfer Mechanism ◽  
Drying Process ◽  
Mass Transfer Mechanism ◽  
At Home

The freeze-drying process is a complex heat and mass transfer process virtually. The drying process of freeze-drying is not only the key stage which decides the success of freeze-drying, but also the most difficult stage to control. There are lots of papers about heat and mass transfer in vacuum freeze drying at home and abroad. The present status of research on heat and mass transfer during vacuum freeze drying in the primary drying is summed up and analyzed, the trend of research in this field is discussed in this paper.

scholarly journals Mathematical model of vacuum freeze-drying in the secondary drying

2007 ◽  
Vol 3 (2) ◽  
pp. 192-196
Author(s):  
Hua Li ◽  
Lihua Li ◽  
Xingli Jiao ◽  
Xueli Qin
Keyword(s):  
Mathematical Model ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Transfer Process ◽  
Present Status ◽  
Freeze Drying ◽  
Mass Transfer Process ◽  
Drying Process ◽  
Secondary Drying ◽  
At Home

The freeze-drying process is a complex heat and mass transfer process virtually. The drying process of freeze-drying is not only the key stage which decides the success of freeze-drying, but also the most difficult stage to control. There are lots of papers about heat and mass transfer in vacuum freeze drying at home and abroad. The present status of research on heat and mass transfer during vacuum freeze drying in the secondary drying is summed up and analyzed, and the trend of research in this field is discussed in this paper.

scholarly journals Features of heat and mass transfer at drying of ceramic products with overglaze paints

2021 ◽  
pp. 7-12
Author(s):  
O.M. Nedbailo ◽  
O.G. Chernyshyn
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat Flux ◽  
Heat And Mass Transfer ◽  
Heat Flux Density ◽  
Heat Dissipation ◽  
Mass Transfer Process ◽  
Drying Process ◽  
Air Velocity ◽  
The Heat Transfer Coefficient

The basic results of researches of process of a heat exchange are instanced and parsed at drying glasour ceramic colors. Character of change of importance number of Rebinder is established at drying colors and dependence of intensity of a heat dissipation on velocity of air is spotted. The main results of researches of heat and mass transfer process at drying of overglaze ceramic paints in a stream of drying agent are resulted and analyzed. The nature of the change in the value of the Rebinder number for drying paints is established and the dependence of the heat transfer intensity on the air velocity is determined. Analysis of the temperature coefficient of drying and Rebinder's number determined the directions of heat consumption in the drying process of overglaze ceramic paints. It is established that the heat flux density depends on the temperature and velocity of the coolant and does not depend on the chemical composition of the paints. It is shown that the heat transfer coefficient depends on the velocity of the coolant. Compared with heat transfer during laminar flow around the plate during drying, the intensity of heat transfer increases by 75%.

Heat and Mass Transfer Model for the Thin Material Layer Consisting of Zinc-Containing Pellets in Rotary Hearth Furnace

2011 ◽  
Vol 236-238 ◽  
pp. 789-794
Author(s):  
Ying Liu ◽  
Nai Shuai Wang ◽  
Zhi Wen ◽  
Guo Feng Lou
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Control Volume ◽  
Mass Transfer Process ◽  
Transfer Model ◽  
Mass Transfer Model ◽  
State Equations ◽  
Material Layer ◽  
Metallization Rate ◽  
Single Pellet

In this paper, a mathematical model is established to simulate heat and mass transfer process among the thin material layer consisting of zinc-containing pellets while being reduced in Rotary Heath Furnace (RHF). The material layer model is based on a single pellet model, coupling heat and mass transfer and chemical reactions. The model essentially involved solving the unsteady-state equations with appropriate initial and boundary conditions using the control volume formulation. Temperature distribution, gas phase concentration, metallization rate, and dezincing rate have been obtained and discussed.

Drying of Rough Rice: A Numerical Investigation

2013 ◽  
Vol 334-335 ◽  
pp. 131-136 ◽  
Author(s):  
José Vieira da Silva ◽  
Filipe Nascimento Silva ◽  
Tony Herbert Freire de Andrade ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Numerical Study ◽  
Mass Transfer Process ◽  
Drying Process ◽  
Ansys Cfx ◽  
Rough Rice ◽  
Ellipsoid Of Revolution ◽  
Rice Drying ◽  
Simultaneous Heat

Drying can be defined as a simultaneous heat and mass transfer process between product and air drying. These phenomena have occurred due to thermal and moisture gradients and they are affected by different parameters. The inadequate management of this process can cause severe damage to the product such as cracking, loss of nutritional properties and even loss of the product quality. Thus, this paper proposes a numerical study of heat and mass transfer that occurs during the rough rice drying process, using the commercial software ANSYS CFX®. Herein the grain was considered as ellipsoid of revolution.

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