Three-dimensional numerical analysis of heat and mass transfer in heat pipes

2006 ◽  
Vol 43 (8) ◽  
pp. 775-785 ◽  
Author(s):  
Tarik Kaya ◽  
John Goldak
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Heat And Mass Transfer ◽  
Three Dimensional ◽  
Heat Pipes

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.

Numerical Analysis of the Heat and Mass Transfer Characteristics in an Autothermal Methane Reformer

2010 ◽  
Vol 7 (5) ◽  
Author(s):  
Joonguen Park ◽  
Shinku Lee ◽  
Sunyoung Kim ◽  
Joongmyeon Bae
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Heat And Mass Transfer ◽  
Steam Reforming ◽  
Space Velocity ◽  
Reaction Model ◽  
Operating Conditions ◽  
Local Thermal Equilibrium ◽  
Inlet Temperature ◽  
Transfer Characteristics

This paper discusses a numerical analysis of the heat and mass transfer characteristics in an autothermal methane reformer. Assuming local thermal equilibrium between the bulk gas and the surface of the catalyst, a one-medium approach for the porous medium analysis was incorporated. Also, the mass transfer between the bulk gas and the catalyst’s surface was neglected due to the relatively low gas velocity. For the catalytic surface reaction, the Langmuir–Hinshelwood model was incorporated in which methane (CH4) is reformed to hydrogen-rich gases by the autothermal reforming (ATR) reaction. Full combustion, steam reforming, water-gas shift, and direct steam reforming reactions were included in the chemical reaction model. Mass, momentum, energy, and species balance equations were simultaneously calculated with the chemical reactions for the multiphysics analysis. By varying the four operating conditions (inlet temperature, oxygen to carbon ratio (OCR), steam to carbon ratio, and gas hourly space velocity (GHSV)), the performance of the ATR reactor was estimated by the numerical calculations. The SR reaction rate was improved by an increased inlet temperature. The reforming efficiency and the fuel conversion reached their maximum values at an OCR of 0.7. When the GHSV was increased, the reforming efficiency increased but the large pressure drop may decrease the system efficiency. From these results, we can estimate the optimal operating conditions for the production of large amounts of hydrogen from methane.

A numerical analysis of heat and mass transfer processes in a macro-patterned methane/steam reforming reactor

2018 ◽  
Vol 43 (45) ◽  
pp. 20474-20487 ◽  
Author(s):  
Marcin Pajak ◽  
Marcin Mozdzierz ◽  
Maciej Chalusiak ◽  
Shinji Kimijima ◽  
Janusz S. Szmyd ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Heat And Mass Transfer ◽  
Steam Reforming ◽  
Methane Steam Reforming ◽  
Transfer Processes ◽  
Methane Steam ◽  
Mass Transfer Processes
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