Method for Determining Overall Performances of Solar Kilns

1987 ◽  
Vol 109 (1) ◽  
pp. 26-29 ◽  
Author(s):  
J. A. Guzman ◽  
A. Lauterbach ◽  
R. Jordan
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Theoretical Model ◽  
Heat And Mass Transfer ◽  
Drying Process ◽  
Solar Kiln ◽  
Model Based ◽  
Transfer Equations

A theoretical model based on heat and mass transfer equations was developed for determining a reliable comparison between different solar kiln designs. It involves dividing the drying process into two sequential steps, one in which only heat transfer occurs and a second one in which the actual drying process takes place. The model gives an equation for determining the evaporated water in function of the normal drying variables, together with a specially defined parameter which gives account for the air recirculation inside the kiln. The model was validated experimentally for a box-type collector solar kiln operating under constant and falling rate drying periods. It was found that although the model could be applied satisfactorily, the tested design proved to be a very inefficient one, giving low values for the recirculating parameter.

Comparisons between Experiments and a Theoretical Model of Heat and Mass Transfer in Rotary Regenerators with Nonsorbing Matrices

1981 ◽  
Vol 103 (2) ◽  
pp. 189-195 ◽  
Author(s):  
J. G. van Leersum ◽  
C. W. Ambrose
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Mass Transfer ◽  
Theoretical Model ◽  
Heat And Mass Transfer ◽  
Equilibrium Model ◽  
Experimental Facility ◽  
Heat And Moisture ◽  
Good Agreement

A mathematical model of condensation, evaporation and heat transfer in a regenerator having a non sorbing matrix is derived. Good agreement between heat and moisture effectivities predicted by a simulation of the model, and corresponding results from an independently derived equilibrium model is shown for a particular case. Details of an experimental facility for testing the performance of a rotary regenerator are given, and a comparison between results obtained from the facility and those produced by the model are given.

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%.

scholarly journals Heat transfer under conditions of operation of a gas infrared emitter and an air exchange system

2021 ◽  
Vol 2057 (1) ◽  
pp. 012125
Author(s):  
B V Borisov ◽  
G V Kuznetsov ◽  
V I Maksimov ◽  
T A Nagornova ◽  
A V Vyatkin
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Two Dimensional ◽  
Exchange System ◽  
Convective Flows ◽  
Exhaust Ventilation ◽  
Transfer Equations ◽  
Infrared Emitter ◽  
Transfer Parameters

Abstract In this work, the processes of heat transfer in a premise heated by a gas infrared emitter (GIE) are studied on the basis of numerical solution of the heat and mass transfer equations in a two-dimensional formulation. Calculations are carried out taking into account the presence of supply and exhaust ventilation in the considered area. Ventilation is required during the operation of high-intensity type GIE. The analysis of the main heat and mass transfer parameters by radiant and convective flows is carried out.

scholarly journals A Numerical Implementation of the Soret Effect in Drying Processes

2020 ◽  
Vol 4 (1) ◽  
pp. 13
Author(s):  
Bartolomeus Häussling Löwgren ◽  
Julius Bergmann ◽  
Odilio Alves-Filho
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Soret Effect ◽  
Numerical Approach ◽  
Transport Mechanisms ◽  
Drying Process ◽  
Governing Equations ◽  
Transfer Equations ◽  
Gradient Effects ◽  
Dynamic Heating

Drying of porous media is strictly governed by heat and mass transfer. However, contrary to the definition that drying is simultaneous transport mechanisms of heat and mass, most past and current models either account for temperature or concentration gradient effects on drying. Even though the complexity of computations of these processes varies with area of application, in most cases, the Dufour and Soret effects are neglected. This leads to deviations and uncertainties on the assumptions and interpretations of these and other relevant effects on drying. This paper covers the theoretical methods to derive the coupled transfer effects. In addition, this work proposes and formulates relevant heat and mass transfer equations, as well as the governing equations for drying processes with Dufour and Soret effects. The application of a numerical approach to solve the equations allows for studying of the influence of these effects on the design and operation of dryers. It is shown that the Soret effect can be highly relevant on drying operations with dynamic heating operation. While for drying processes where the steady state drying process predominates, the effect is deemed negligible.

Numerical Simulation Analysis of Heat and Mass Transfer during Drying of Jujubes

2012 ◽  
Vol 468-471 ◽  
pp. 2323-2327
Author(s):  
Xiao Kang Yi ◽  
Wen Fu Wu ◽  
He Lei Cui ◽  
Jun Xing Li
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Simulation Analysis ◽  
Internal Heat ◽  
Simulation Software ◽  
Drying Process ◽  
Finite Volume Discretization ◽  
Transfer Equations ◽  
Labview Program

A finite volume discretization method for solving the heat and mass transfer equations of drying jujubes was developed in this paper. Combined with the Labview program, development of a numerical simulation software for internal heat and mass transfer during drying of jujubes, and simulation of the drying process on the jujubes using the software. The results showed that the simulation results and experimental data were consistent.

Evaluation and Development of Simple Evaporation Models Used in Spray Simulations

2005 ◽  
Author(s):  
G. F. Yao
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Droplet Evaporation ◽  
Droplet Surface ◽  
Published Data ◽  
Single Droplet ◽  
New Model ◽  
Transfer Equations ◽  
Evaporation Models

Given the droplet surface temperature distribution versus time derived from the recent numerical modeling and experimental measurements of a single droplet evaporation, the gas side heat and mass transfer equations used in simple evaporation models for spray simulation in CFD codes are first evaluated. A new model for droplet evaporation is formulated. Instead of using the infinite or conduction limited models for liquid side heat transfer, in the new model, the liquid side heat transfer is simulated based on the Nusselt number. The model is validated against the published data and was found to be accurate in representing the gas and liquid side heat and mass transfer of a single droplet evaporation.

A Theoretical Model for Unsteady Coupled Heat and Mass Transfer Phenomena in Industrial Dryers

2011 ◽  
Vol 42 (5) ◽  
pp. 415-432
Author(s):  
Hossein Shokouhmand ◽  
Sajjad Bigham ◽  
Sajjad Yazdani
Keyword(s):  
Mass Transfer ◽  
Theoretical Model ◽  
Heat And Mass Transfer

scholarly journals Modeling and simulation of heat and mass transfer in an Ethiopian fresh injera drying process

Heliyon ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. e06201
Author(s):  
Alamrew B. Solomon ◽  
Solomon W. Fanta ◽  
Mulugeta A. Delele ◽  
Maarten Vanierschot
Keyword(s):  
Mass Transfer ◽  
Modeling And Simulation ◽  
Heat And Mass Transfer ◽  
Drying Process
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