scholarly journals Heat and Mass Transfer Behavior Prediction and Thermal Performance Analysis of Earth-to-Air Heat Exchanger by Finite Volume Method

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1542 ◽  
Author(s):  
Qinggong Liu ◽  
Zhenyu Du ◽  
Yi Fan
Keyword(s):  
Mass Transfer ◽  
Heat Exchanger ◽  
Performance Analysis ◽  
Finite Volume Method ◽  
Heat And Mass Transfer ◽  
Finite Volume ◽  
Thermal Performance ◽  
Behavior Prediction ◽  
Transfer Behavior ◽  
Volume Method

Absorption and Evaporation Mass Transfer Simulation of a Droplet by Finite Volume Method and SIMPLEC Algorithm

2011 ◽  
Vol 110-116 ◽  
pp. 4315-4323
Author(s):  
S. Torfi ◽  
S.M. Hosseini Nejad
Keyword(s):  
Mass Transfer ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Equations Of Motion ◽  
Superheated Water ◽  
Mass Ratio ◽  
Solvent Vapor ◽  
Simplec Algorithm ◽  
Temperature Constant ◽  
Volume Method

In this paper, a numerical model is developed to simulate single droplet heat and mass transfer in a two-pieces solution with a saturated solvent vapor environment. Finite volume method and transient SIMPLEC algorithm in spherical coordinates system used for simulation. For simulation of the mass transfer, dimensionless equations of motion, heat transfer and mass transfer (based on mass ratio) are solved simultaneously. All the thermodynamic and transitional solution properties have been considered as a function of temperature and concentration. Verification of method is done by compare these numerical results with analytical and numerical analysis of other studies. Evaporation, absorption and condensation contours in a water droplet at uniform temperature at superheated water vapor and Distribution of Droplet's Surface Temperature, Constant Temperature and concentration lines as the modeling results are presented. The results are shown that 0.5% increase of concentration of droplet cause increase 8 degree C of mean temperature of droplet.

Effect of the Asymmetric Baffle Shape on the Thermal Performance Using Non-Newtonian Fluids

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Mohsen Rostam ◽  
Elham Omidbakhsh Amiri
Keyword(s):  
Finite Volume Method ◽  
Finite Volume ◽  
Thermal Performance ◽  
Physical Phenomenon ◽  
Newtonian Fluids ◽  
Working Fluid ◽  
Effective Parameters ◽  
Vertical Rectangle ◽  
Different Shapes ◽  
Volume Method

The efficiency of industrial heat equipment can be increased using baffles. The shape of baffles is one of the effective parameters. In this work, the effect of shapes of asymmetric baffles on the thermal performance has been investigated. Four different shapes as rectangular diagonal, trapezoidal, triangular and semi-ellipsoid, as well as, vertical rectangle (as the base model) were used. Also, four non-Newtonian fluids were used as the working fluid. The governing equation, which models the physical phenomenon, was solved with the finite volume method. The results showed that better thermal performance could be observed with semi-ellipsoid baffle for all four non-Newtonian fluids. However, for different models of non-Newtonian fluids, the average of increasing of thermal performance with different percent was achieved. By comparing different models of non-Newtonian fluids, shear-thinning model shows better thermal performance than other models.

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