Begell House Inc.
International Journal of Fluid Mechanics Research
FMR
2152-5102
46
1
2019
HEAT AND MASS TRANSFER ON MHD FREE CONVECTIVE FLOW OVER AN INFINITE NONCONDUCTING VERTICAL FLAT POROUS PLATE
1-25
10.1615/InterJFluidMechRes.2018025004
M Veera
Krishna
Dept of Mathematics, Rayalaseema University, Kurnool, Andhra Pradesh, India - 518007
M. Gangadhar
Reddy
Department of Mathematics, Rayalaseema University, Kurnool, Andhra Pradesh-518007,
India
Ali J.
Chamkha
Mechanical Engineering Department, Prince Sultan Endowment for Energy and
Environment, Prince Mohammad Bin Fahd University, Al-Khobar 31952, Saudi Arabia; RAK Research and Innovation Center, American University of Ras Al Khaimah, P.O. Box
10021, Ras Al Khaimah, United Arab Emirates
heat and mass transfer
infinite vertical flat plate
Laplace transform technique
MHD flows
porous medium
In this paper, we consider the unsteady magnetohydrodynamic free convection flow of an electrically conducting viscous
incompressible and heat-absorbing fluid through a porous medium over an infinite vertical flat plate under the
influence of uniform transverse magnetic field. The flow is induced by a general time-dependent movement of a vertical
plate. The flow through the porous medium is governed by Brinkman's model for the momentum equation. The exact
solutions for the velocity, temperature, and concentration are obtained making use of the Laplace transform technique.
The influence of various governing flow parameters on the velocity, temperature, and concentration is analyzed graphically, and numerical solutions for the skin friction, Nusselt number, and Sherwood number are also obtained in tabular forms for both ramped temperature and isothermal plates. Some important applications of practical interest are also discussed for different types of plate motions.
NUMERICAL STUDY OF MHD BOUNDARY LAYER FLOW OF A VISCOELASTIC AND DISSIPATIVE FLUID PAST A POROUS PLATE IN THE PRESENCE OF THERMAL RADIATION
27-38
10.1615/InterJFluidMechRes.2018020153
G.
Sivaiah
Department of Mathematics, Rayalaseema University, Kurnool-518002, A.P., India
Konda Jayarami
Reddy
Department of Mathematics, K.L. University, Vaddeswaram, Guntur-522502, A.P., India
P. Chandra
Reddy
Department of Mathematics, Annamacharya Institute of Technology and Sciences, Rajampet,
Kadapa-516126, A.P., India
M. C
Raju
Jawaharlal Nehru Technological University Anantapur, College of Engineering Pulivendula
MHD
thermal radiation
variable suction
variable permeability
vertical porous plate
heat and mass transfer
In this manuscript, an investigation is done to analyze various properties of fully developed free convective flow of a viscous incompressible electrically conducting viscoelastic and dissipative fluid past a vertical porous plate bounded by a porous medium in the presence of thermal radiation and variable permeability. A magnetic field of uniform strength is applied perpendicular to the plate, and the presence of a heat source is also considered. The coupled dimensionless nonlinear partial differential equations are solved numerically by finite difference method. The numerical computations have been studied through graphs. The presence of thermal radiation decreases the temperature, and an opposite nature is shown in the case of Eckert number.
EXPERIMENTAL AND SIMULATION STUDIES ON AERODYNAMIC DRAG REDUCTION OVER A PASSENGER CAR
39-61
10.1615/InterJFluidMechRes.2018025171
Ajitanshu
Vedrtnam
Vinoba Bhave Research Institute, Allahabad, UP, 211004, India; Department of Mechanical Engineering, Invertis University, Bareilly, UP,
243001, India; Translational Research Centre, Institute of Advanced Materials, VBRI,
Linkoping 58330, Sweden
Dheeraj
Sagar
Department of Mechanical Engineering, Invertis University, Bareilly, UP, 243001, India
aerodynamics
drag reduction
surface static pressure
passenger car
wind tunnel
flow visualization
The present experimental and simulation investigation includes aerodynamic drag reduction over a car by flow control using a vortex generator (VG) and spoiler. The model of the car was fabricated on the scale of 15:1 using plaster of Paris. A test facility is built to convincingly replicate the flow over a model of a high-speed car. Primarily, the car model is tested at different incidence angles of flow to obtain total drag over the model. Furthermore, 26 different combinations were tested to find out the condition for minimum drag. In the crosswind condition (± 30 deg), 36.36% additional area of the car is exposed to the direct wind that causes an increment of 38.61% in the drag coefficient. The increment of flow angle from 0 to 30 deg causes flow separation on the roof of the vehicle near the leeward corner. The maximum 68.18% drag coefficient is reduced at β = 0 deg, α = +45 deg, and the co-rotating VG. The best combination in terms of a surface static pressure coefficient rise (from -0.041 to +2.622) is found at β = 0 deg, α = 0 deg, and the VG attached to the upstream of the spoiler. A formulated computational fluid dynamics model is in good match with the experimental results.
ANALYSIS OF THE EXCHANGE PROCESS IN ICE USING A MOVING MESH APPROACH
63-87
10.1615/InterJFluidMechRes.2018024538
Mustapha
Bordjane
Laboratoire de Mécanique Appliquée (LMA), Université des Sciences et de la Technologie
Mohamed Boudiaf d'Oran, B.P. 1505, El Mnaouer, 31000 Oran-Algérie
David
Chalet
LHEEA Lab (ECN/CNRS), Ecole Centrale de Nantes, 44300 Nantes, France
exchange process
moving mesh
CFD simulation
modeling methods
fluid flow
turbulence model
Fluid flow characteristics in internal combustion engines have been studied for a long time by experimental approaches. But today, computational fluid dynamics (CFD) simulations have become a useful tool, especially with new, more powerful computers. On another side, experimental tests have become highly onerous and overpriced. In addition,
investigations using this kind of methodology are limited to small parts of the system. Thus, an alternative solution
to carry out this study is CFD simulation and modeling. The latter is more economical in time and cost. The aim
of this article is to explore the flow characteristics during the exchange process, which has a crucial influence on the performance of the internal combustion engine and on pollutant emissions and noise. In this study, two different
approaches related to the modeling of engines are tested: CFD simulations using a moving mesh strategy and a zero-dimensional model, the so-called inertial capacitive model. For the first approach, a dynamic mesh model was used to simulate piston, intake, and exhaust valve motion during the open phase of a nonignited single-cylinder four-stroke-cycle engine. The second approach used in this study was retained to the formulation and application of the new (0D) inertial capacitive model based on the first thermodynamic principle, Newton's second law, and the associated laws of fluid mechanics relative to gas dynamics in the intake and exhaust manifolds of internal combustion engines. The subject of the second approach is to check the validity of the CFD analysis and to calibrate some parameters deduced from the tuning process of the problem considered.
NUMERICAL ANALYSIS OF A PLANE LAMINAR JET IN A PULSED COFLOW
89-99
10.1615/InterJFluidMechRes.2018025249
Mohamed Heidi
Zaafouri
VDEC, Higher Institute of Environmental Technologies of Urban Planning and Building
(ISTEUB), University of Carthage, National Engineering School of Monastir, Tunisia
Sabra
Habli
VDEC, Higher Institute of Environmental Technologies of Urban Planning and Building
(ISTEUB), University of Carthage, Tunisia
plane jet
laminar
co-current flow
pulse amplitude
Strouhal number
velocity ratio
Froude number
A numerical study using a finite difference method was used to analyze a nonisothermal unsteady laminar plane jet
emerging into a co-current flow submitted to a sinusoidal disturbance. The present study investigated a parametric
analysis of the influence of an initial perturbation of the co-current flow on dynamic and thermal behaviors of the jet
over time. The selected parameters are essentially the pulse amplitude, Strouhal number, velocity ratio, and Froude
number.