A COMPUTATIONAL STUDY OF HEAT AND MASS TRANSFER FROM A CIRCULAR CYLINDER IN OSCILLATORY FLOW

Modeling fluid flows is a general procedure to handle engineering problems. Here we present a systematic study of the flow and heat transfer around a circular cylinder by introducing a new representative appropriate drag coefficient concept. We demonstrate that the new modified drag coefficient may be a preferable dimensionless parameter to describe more appropriately the fluid flow physical behavior. A break in symmetry in the global structure of the entire flow field increases the difficulty of predicting heat and mass transfer behavior. A general simple drag model with high accuracy is further developed over the entire range of Reynolds numbers met in practice. In addition, we observe that there may exist an inherent relation between the drag and heat and mass transfer. A simple analogy model is established to predict heat transfer behavior from the cylinder drag data. This finding provides great insight into the underlying physical mechanism.

Download Full-text

Computational Study of Liquid Film Evaporation along a Wavy Wall of a Vertical Channel

Mathematical Problems in Engineering ◽

10.1155/2018/4208059 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Monssif Najim ◽

M’barek Feddaoui ◽

Abderrahman Nait Alla ◽

Adil Charef

Keyword(s):

Mass Transfer ◽

Liquid Film ◽

Heat And Mass Transfer ◽

Numerical Study ◽

Computational Study ◽

Vertical Channel ◽

Wavy Wall ◽

Gas Phases ◽

Multiple Parameters ◽

Film Evaporation

A numerical study of mixed convection heat and mass transfer along a vertical channel with a wavy wall is performed. The wavy wall is heated by a constant flux, while the other is adiabatic. The discretisation of equations in both liquid and gas phases is realised using an implicit finite difference scheme. Results of simulation compare the effect of multiple parameters, especially amplitude and characteristic length of the curve, on the liquid film evaporation process. The results indicate that heat and mass transfer is enhanced by increasing the amplitude and number of wall waves. Moreover, a very small value of waves amplitude of the wall may reduce the sensible heat and mass transfer.

Download Full-text

Perturbation analysis of magnetohydrodynamics oscillatory flow on convective-radiative heat and mass transfer of micropolar fluid in a porous medium with chemical reaction

Engineering Science and Technology an International Journal ◽

10.1016/j.jestch.2015.09.003 ◽

2016 ◽

Vol 19 (1) ◽

pp. 444-462 ◽

Cited By ~ 10

Author(s):

Dulal Pal ◽

Sukanta Biswas

Keyword(s):

Mass Transfer ◽

Porous Medium ◽

Heat And Mass Transfer ◽

Chemical Reaction ◽

Perturbation Analysis ◽

Micropolar Fluid ◽

Oscillatory Flow ◽

Radiative Heat

Download Full-text

Effects of hall currents with heat and mass transfer on the peristaltic transport of a Casson fluid through a porous medium in a vertical circular cylinder

Thermal Science ◽

10.2298/tsci180222185e ◽

2020 ◽

Vol 24 (2 Part B) ◽

pp. 1067-1081

Author(s):

Nabil El-Dabe ◽

Galal Moatimid ◽

Mona Mohamed ◽

Yasmeen Mohamed

Keyword(s):

Mass Transfer ◽

Circular Cylinder ◽

Heat And Mass Transfer ◽

Fluid Motion ◽

Casson Fluid ◽

Peristaltic Transport ◽

Heat Radiation ◽

Physical Parameters ◽

Shooting Technique ◽

Basic Behavior

In the current paper, the peristaltic transport of a non-Newtonian fluid obeying a Casson model with heat and mass transfer inside a vertical circular cylinder is studied. The considered system is affected by a strong horizontal uniform magnetic field together with the heat radiation and the Hall current. The problem is modulated mathematically by a system of PDE that describe the basic behavior of the fluid motion. The boundary value problem is analytically solved with the appropriate boundary conditions in accordance with the special case, in the absence of the Eckert number. The solutions are obtained in terms of the modified Bessel function of the first kind. Again, in the general case, the system is solved by means of the homotopy perturbation and then numerically through the Runge-Kutta Merson with a shooting technique. A comparison is done between these two methods. Therefore, the velocity, temperature and concentration distributions are obtained. A set of diagrams are plotted to illustrate the influence of the various physical parameters in the forgoing distributions. Finally, the trapping phenomenon is also discussed.

Download Full-text