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Articles by E. Esmaeilzadeh
Total Records ( 3 ) for E. Esmaeilzadeh
  E. Esmaeilzadeh , A. Alamgholilou and H. Mirzaie
  In this study, investigation on hydrodynamic and forced convection heat transfer in a rectangular horizontal duct have been studied. Heat sources were cross rectangular ribs with small aspect ratio and uniform heat flux under turbulent regime. The purpose of this study is application of a passive method to increase rate of heat transfer from the ribs. Geometry and the physics of the problem are similar to cooling of electronic boards. Therefore three rectangular ribs established along the width of the channel with specified distance from each other. Between ribs some vortexes were appeared which in general were acted as heat traps and thus reduced heat transfer rate. These thermal resistances should be neutralized by applying heat transfer enhancement methods. Due to low pressure of these areas in comparison with their surrounding environment, establishing holes between the ribs is an appropriate method for vanishing the heat traps. Actually by applying holes between the ribs, some distortions in the vortex patterns are made and an enhancement in the heat transfer due to existence of secondary flows, are made subsequently. These phenomena are occurred without any outsource energies. This method classified as passive method. Numerical simulation for assumed geometry is performed by solving governing equations in finite volume with Phoenics software. The obtained simulated results indicate good agreements with experimental investigations which have been reported by other researchers. Comparison between plain and passive cases shows that performance evaluation criteria (PEC) is highly dependant on the holes geometric parameters, specially their numbers and arrangements. Nine different arrangements for holes with same number of holes were studied comprehendly in this research.
  E. Esmaeilzadeh , A. Alamgholilou , H. Mirzaie and M. Ashna
  The aim of this study is an application of the EHD actuator on local heat transfer enhancement by using wire-plate electrodes in laminar and turbulent duct flow. In this study, the effects of an electric field and temperature field on the fluid flow as an active method of enhancement is numerically investigated. The hydrodynamics and heat transfer behaviors of laminar and turbulent duct flow with specific boundary conditions in the presence of an EHD actuator was taken into consideration. The partial difference equations of flow field and electric field namely continuity, momentum and energy equations for fluid flow and electric current and Poisson’s equations for electric field was numerically solved with finite volume method. At first, the electric equations were solved and then the results were imported to the fluid field for improvement of the body forces. The obtained results show for the flows with Re≤1000 with single wire-plate electrode is suitable for local enhancement. By adding the number of wires to three, it is possible to use this method for turbulent flow up to Re = 2000.
  F. Mardkari , M. Aghakhani and E. Esmaeilzadeh
  The external flows around bluff bodies play an important role in industrial applications and have been studied by many researchers. The major problem in such studies is decreasing total drag. In this study experimental results of flow control over a cylindrical configuration by means of an EHD actuators represented. Wire-plate actuators were investigated in this study. This study performed by placing a cylindrical cross section in a wind tunnel and measuring pressures in several positions. Results are given in two ground electrode arrangements, In the first case whole surface of cylinder is covered with a flush mounted electrode as ground electrode and one or two wires electrodes positioned at distance from cylinder, In the second case, only 30 degrees of cylinder used as ground electrode. In all cases the wire electrode was set up in three different degrees from leading edge (i.e., 0°, 50°, 100°) and three radial distance from the surface of the cylinder (i.e., h = 10, 20, 30 mm). The electrical fields were produced by means of a DC constant high voltage power supply. In this study experiments are limited to laminar flow around the cylinder with Reynolds number less than 1000. The experimental results show that, total drag reduction in the partly flush mounted plate electrode has better performance than the case which electrode covers all surface of the cylinder. Maximum total drag reduction in cathode, partly flush mounted plate electrode geometry at position of 100° from the leading edge, which reported to be about 8%.
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