scholarly journals Effect of Magnetic Field on Entropy Generation Due to Laminar Forced Convection Past a Horizontal Flat Plate

Entropy ◽  
2004 ◽  
Vol 6 (3) ◽  
pp. 293-303 ◽  
Author(s):  
Mohammed Al-Odat ◽  
Renhe Damseh ◽  
Moh\'d Al-Nimr
Keyword(s):  
Magnetic Field ◽  
Flat Plate ◽  
Forced Convection ◽  
Entropy Generation ◽  
Laminar Forced Convection

Entropy generation of laminar-forced convection along the wavy surface

2010 ◽  
Vol 7 (5) ◽  
pp. 564 ◽  
Author(s):  
Cha'o Kuang Chen ◽  
Yue Tzu Yang ◽  
Kuei Hao Chang
Keyword(s):  
Forced Convection ◽  
Entropy Generation ◽  
Wavy Surface ◽  
Laminar Forced Convection

scholarly journals Numerical investigation of entropy generation in laminar forced convection flow over inclined backward and forward facing steps in a duct under bleeding condition

2014 ◽  
Vol 18 (2) ◽  
pp. 479-492 ◽  
Author(s):  
Meysam Atashafrooz ◽  
Nassab Gandjalikhan ◽  
Babak Ansari
Keyword(s):  
Numerical Investigation ◽  
Forced Convection ◽  
Entropy Generation ◽  
Fluid Dynamic ◽  
Numerical Results ◽  
Convection Flow ◽  
Bejan Number ◽  
Entropy Generation Number ◽  
Forced Convection Flow ◽  
Laminar Forced Convection

A numerical investigation of entropy generation in laminar forced convection of gas flow over a recess including two inclined backward and forward facing steps in a horizontal duct under bleeding condition is presented. For calculation of entropy generation from the second law of thermodynamics in a forced convection flow, the velocity and temperature distributions are primary needed. For this purpose, the two-dimensional Cartesian coordinate system is used to solve the governing equations which are conservations of mass, momentum and energy. These equations are solved numerically using the computational fluid dynamic techniques to obtain the temperature and velocity fields, while the blocked region method is employed to simulate the inclined surface. Discretized forms of these equations are obtained by the finite volume method and solved using the SIMPLE algorithm. The numerical results are presented graphically and the effects of bleeding coefficient and recess length as the main parameters on the distributions of entropy generation number and Bejan number are investigated. Also, the effect of Reynolds number and bleeding coefficient on total entropy generation which shows the amount of flow irreversibilities is presented for two recess length. The use of present results in the design process of such thermal system would help the system attain the high performance during exploitation. Comparison of numerical results with the available data published in open literature shows a good consistency.

Entropy Generation in Thermally Developing Laminar Forced Convection Through a Slit Microchannel

2010 ◽  
Author(s):  
Arman Sadeghi ◽  
Mostafa Baghani ◽  
Mohammad Hassan Saidi
Keyword(s):  
Forced Convection ◽  
Entropy Generation ◽  
Energy Equation ◽  
Integral Transform ◽  
Axial Coordinate ◽  
Entropy Generation Number ◽  
Group Parameter ◽  
Laminar Forced Convection ◽  
Thermal Entrance ◽  
Increasing Function

The issue of entropy generation in laminar forced convection of a Newtonian fluid through a slit microchannel is analytically investigated by taking the viscous dissipation effect, the slip velocity and the temperature jump at the wall into account. Flow is considered to be hydrodynamically fully developed but thermally developing. The energy equation is solved by means of integral transform. The results demonstrate that to increase Knudsen number is to decrease entropy generation, while the effect of increasing values of Brinkman number and the group parameter is to increase entropy generation. Also it is disclosed that in the thermal entrance region the average entropy generation number over the cross section of channel is an increasing function of axial coordinate.

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