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Journal Cover CFD Letters
   [4 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2180-1363
     Published by ISSR Journals Homepage  [3 journals]   [SJR: 0.256]   [H-I: 2]
  • Numerical analysis of heat transfer from a spheroidal shaped body to a
           Power law fluid at Finite Reynolds Number

    • Authors: B Srinivas, KV Ramesh
      Abstract: A vast majority of operations occur in the process industry involving flow of fluid past solids.  Some examples are packed beds, fluidized beds, pneumatic conveyors, filters, thickeners, cyclone separators, hydrocyclones, centrifuges etc.  A comprehensive understanding of the transport processes is essential in the design, operation and control of processes carried out in such equipment.  Without having a thorough knowledge of these transport processes involving a single particle, understanding the behavior of the multiparticle systems is not feasible.  Although many investigations were conducted in this direction, the fluid employed was mainly Newtonian and the solids were regular shaped.  Since most of the industrial fluids are non-Newtonian, these studies are of little use.  In this regard, an attempt is made to numerically investigate the flow of a power law fluid past a stationary spheroid.  The range of parameters investigated in this study is:  10 ≤Re ≤100; 1 ≤Pr ≤100; 0.4 ≤n ≤1.6; and 0.5 ≤E ≤2.  The variation of local Nusselt number on the surface of both oblate and prolate spheroids was obtained.  The effect of modified Reynolds number, modified Prandtl number, axis ratio, power law index on average Nusselt number were also obtained.  A correlation was developed using least squares regression analysis.  The values predicted using this correlation were found to be in good agreement with the data of earlier investigators
      PubDate: 2014-09-27
      Issue No: Vol. 6 (2014)
       
  • CFD Modelling of Natural Convection in Air Cavities

    • Authors: Yingchun Ji
      Abstract: This paper discusses the modelling of natural convection in air cavities using four eddy viscosity turbulence models. Two 2D closed cavities with deferentially heated walls opposite each other and one 3D open ended tall cavity with one side is heated and adiabatic for all the others were investigated. The CFD simulation results for the two 2D cases were compared with their corresponding experimental measurements and it was found that the k-omega turbulence model offered the best solution among the turbulence models tested. Close agreement was also achieved between the k-omega model and the experiments in the prediction of temperature and velocity fields for the 3D case with Monte Carlo radiation model. The work has demonstrated the ability of the eddy viscosity turbulence models for modelling natural convection and radiation in different types of cavities.
      PubDate: 2014-09-27
      Issue No: Vol. 6 (2014)
       
  • Numerical Simulation Of Double Diffusive Laminar Mixed Convection In A
           Horizontal Rotating Annulus Part (I): Effect Of Richardson And Lewis
           Numbers

    • Authors: Wael El-Maghlany, Mohamed Teamah, Medhat M Sorour, Heba M Abdel Aziz
      Abstract: A numerical study of double-diffusive mixed convection within a horizontal rotating annulus has been investigated. The outer cylinder is fixed but the inner cylinder is considered to rotate in clockwise and anti-clockwise directions to introduce the forced convection effect. In addition, the solutal and thermal buoyancy forces are sustained by maintaining the inner and outer cylinder at uniform temperatures and concentrations but their values for the inner are higher than the outer. The flow is considered laminar regime under steady state conditions. The transport equations for the continuity, momentum, energy and mass transfer are solved using the finite volume technique. The considered domains in this investigation are: 0.01≤ Ri ≤ 100 and 0.01 ≤ Le ≤ 100. While the thermal Grashof number, Prandtl number, buoyancy ratio and the radius ratio are kept constant at values equal to104, 0.7, 1 and 2 respectively. The effect of the selected parameters on the local and average Nusselt and Sherwood numbers are presented and studied. Finally, this investigation concerned with selection the best direction of the inner cylinder rotation to enhance both heat and mass transfer. A comparison was made with the published results and a good agreement was found.
      PubDate: 2014-09-27
      Issue No: Vol. 6 (2014)
       
 
 
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