Heat and fluid flow through a helical annulus enhanced by a porous material: A perturbation study

2017 ◽  
Vol 112 ◽  
pp. 1566-1574 ◽  
Author(s):  
Nima Tirandaz ◽  
Maziar Dehghan ◽  
Mohammad Sadegh Valipour
Keyword(s):  
Fluid Flow ◽  
Porous Material ◽  
Flow Through ◽  
Heat And Fluid Flow

scholarly journals Chemical Entropy Generation and MHD Effects on the Unsteady Heat and Fluid Flow through a Porous Medium

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Gamal M. Abdel-Rahman Rashed
Keyword(s):  
Magnetic Field ◽  
Porous Medium ◽  
Fluid Flow ◽  
Entropy Generation ◽  
Lewis Number ◽  
Heat Transfer Fluid ◽  
Governing Equations ◽  
Flow Through ◽  
Heat And Fluid Flow ◽  
Chemical Reaction Parameter

Chemical entropy generation and magnetohydrodynamic effects on the unsteady heat and fluid flow through a porous medium have been numerically investigated. The entropy generation due to the use of a magnetic field and porous medium effects on heat transfer, fluid friction, and mass transfer have been analyzed numerically. Using a similarity transformation, the governing equations of continuity, momentum, and energy and concentration equations, of nonlinear system, were reduced to a set of ordinary differential equations and solved numerically. The effects of unsteadiness parameter, magnetic field parameter, porosity parameter, heat generation/absorption parameter, Lewis number, chemical reaction parameter, and Brinkman number parameter on the velocity, the temperature, the concentration, and the entropy generation rates profiles were investigated and the results were presented graphically.

scholarly journals Overview of the innovative heat exchangers technologies

2020 ◽  
Vol XXIII (2) ◽  
pp. 32-36
Author(s):  
Avram Elena Rita
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Exchangers ◽  
Micro Channels ◽  
Flow Processes ◽  
Military Applications ◽  
Flow Through ◽  
Heat And Fluid Flow ◽  
Resistance To Heat ◽  
Similitude Theory

The current paper analyzed the new trends and challenges in heat exchanger technologies. The progress of the studies on mini and micro devices used in industry are presented. Particular attention is paid to the heat exchangers used in marine and chemical industries where the resistance to heat transfer increases due to the fouling or scaling. In the industry, there are very important the reduction in the size of devices, and the micro heat exchangers, due to its variety of advantages offered, are well recognized for their higher performance. The applications of them are ranging from process control to military applications. New engineering approaches for modeling the heat and fluid flow processes in micro heat exchangers are analyzed in the present paper. One of these is based on the dimensional analysis and principles of similitude theory that allow the modeling of microscale systems using a physical system at the mini scale. There are identified constant relationships between dimensions permitting the analysis of the fluid flow through micro channels.

Numerical Simulation for Heat and Fluid Flow Through Porous Media

2011 ◽  
Author(s):  
Masayuki Kaneda ◽  
Yusuke Matsushima ◽  
Kazuhiko Suga
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Pore Structure ◽  
Porous Wall ◽  
Constant Heat Flux ◽  
Face Centered Cubic ◽  
Flow Through ◽  
Face Centered ◽  
Boltzmann Method ◽  
Heat And Fluid Flow

Heat and Fluid flow through infinite porous media is numerically studied. The pore structure considered is body-centered cubic (BCC) and face-centered cubic (FCC) whose porosity is ranged 0.93–0.98 by changing the pore diameter. For the thermal condition, a constant heat flux from the porous wall is considered. The heat and fluid flow simulations are carried out separately by the lattice Boltzmann method (LBM). It is confirmed that the LBM can simulate them properly and the permeability depends on the pore structure compared at the same porosity. The heat transfer coefficient is found to be affected not only by the permeability but also the pore structure. That is, even at the same permeability, the Nusselt number depends on the structure.

Sign in / Sign up

Export Citation Format

Share Document