The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Reza Tasouji Azar - One of the best experts on this subject based on the ideXlab platform.
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Baffle Space impact on the performance of helical Baffle shell and tube heat exchangers
Applied Thermal Engineering, 2012Co-Authors: Farhad Nemati Taher, Sirous Zeyninejad Movassag, Kazem Razmi, Reza Tasouji AzarAbstract:Abstract Heat exchange devices are essential components in complex engineering systems related to energy generation and energy transformation in industrial scenes. Modelling of shell and tube heat exchanger, for design and performance evaluation, is now an established technique in industrial fields. In this paper, heat exchangers with non-continuous helical Baffles based on periodic boundaries have been simulated by using commercial code of FLUENT. All possible attempts were made to obtain the influence of Baffle Spaces on fluid flow and heat transfer on the shell side of by using the same geometrical and thermo-physical conditions. Helical Baffles corresponded to the helix angles of 40°, and 5 heat exchangers with different Baffle Spaces were designed. Designed Baffle Spaces are: for case A: 15 mm (a minimum elected Space), for case B: P/16, for case C: P/8 (middle-overlap type), for case D: 3P/16 and for case E: P/4 (end-to-end type). P refers to helix pitch. The results of simulations indicate that for the same mass flow rate, the heat transfer per unit area decreases with the increase of Baffle Spaces; however, for the same pressure drop, the most extended Baffle Space (Case E) obtains higher heat transfer. We also found out that the pressure gradient decreases with the increase of Baffles Space.
Farhad Nemati Taher - One of the best experts on this subject based on the ideXlab platform.
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Baffle Space impact on the performance of helical Baffle shell and tube heat exchangers
Applied Thermal Engineering, 2012Co-Authors: Farhad Nemati Taher, Sirous Zeyninejad Movassag, Kazem Razmi, Reza Tasouji AzarAbstract:Abstract Heat exchange devices are essential components in complex engineering systems related to energy generation and energy transformation in industrial scenes. Modelling of shell and tube heat exchanger, for design and performance evaluation, is now an established technique in industrial fields. In this paper, heat exchangers with non-continuous helical Baffles based on periodic boundaries have been simulated by using commercial code of FLUENT. All possible attempts were made to obtain the influence of Baffle Spaces on fluid flow and heat transfer on the shell side of by using the same geometrical and thermo-physical conditions. Helical Baffles corresponded to the helix angles of 40°, and 5 heat exchangers with different Baffle Spaces were designed. Designed Baffle Spaces are: for case A: 15 mm (a minimum elected Space), for case B: P/16, for case C: P/8 (middle-overlap type), for case D: 3P/16 and for case E: P/4 (end-to-end type). P refers to helix pitch. The results of simulations indicate that for the same mass flow rate, the heat transfer per unit area decreases with the increase of Baffle Spaces; however, for the same pressure drop, the most extended Baffle Space (Case E) obtains higher heat transfer. We also found out that the pressure gradient decreases with the increase of Baffles Space.
Sirous Zeyninejad Movassag - One of the best experts on this subject based on the ideXlab platform.
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Baffle Space impact on the performance of helical Baffle shell and tube heat exchangers
Applied Thermal Engineering, 2012Co-Authors: Farhad Nemati Taher, Sirous Zeyninejad Movassag, Kazem Razmi, Reza Tasouji AzarAbstract:Abstract Heat exchange devices are essential components in complex engineering systems related to energy generation and energy transformation in industrial scenes. Modelling of shell and tube heat exchanger, for design and performance evaluation, is now an established technique in industrial fields. In this paper, heat exchangers with non-continuous helical Baffles based on periodic boundaries have been simulated by using commercial code of FLUENT. All possible attempts were made to obtain the influence of Baffle Spaces on fluid flow and heat transfer on the shell side of by using the same geometrical and thermo-physical conditions. Helical Baffles corresponded to the helix angles of 40°, and 5 heat exchangers with different Baffle Spaces were designed. Designed Baffle Spaces are: for case A: 15 mm (a minimum elected Space), for case B: P/16, for case C: P/8 (middle-overlap type), for case D: 3P/16 and for case E: P/4 (end-to-end type). P refers to helix pitch. The results of simulations indicate that for the same mass flow rate, the heat transfer per unit area decreases with the increase of Baffle Spaces; however, for the same pressure drop, the most extended Baffle Space (Case E) obtains higher heat transfer. We also found out that the pressure gradient decreases with the increase of Baffles Space.
Kazem Razmi - One of the best experts on this subject based on the ideXlab platform.
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Baffle Space impact on the performance of helical Baffle shell and tube heat exchangers
Applied Thermal Engineering, 2012Co-Authors: Farhad Nemati Taher, Sirous Zeyninejad Movassag, Kazem Razmi, Reza Tasouji AzarAbstract:Abstract Heat exchange devices are essential components in complex engineering systems related to energy generation and energy transformation in industrial scenes. Modelling of shell and tube heat exchanger, for design and performance evaluation, is now an established technique in industrial fields. In this paper, heat exchangers with non-continuous helical Baffles based on periodic boundaries have been simulated by using commercial code of FLUENT. All possible attempts were made to obtain the influence of Baffle Spaces on fluid flow and heat transfer on the shell side of by using the same geometrical and thermo-physical conditions. Helical Baffles corresponded to the helix angles of 40°, and 5 heat exchangers with different Baffle Spaces were designed. Designed Baffle Spaces are: for case A: 15 mm (a minimum elected Space), for case B: P/16, for case C: P/8 (middle-overlap type), for case D: 3P/16 and for case E: P/4 (end-to-end type). P refers to helix pitch. The results of simulations indicate that for the same mass flow rate, the heat transfer per unit area decreases with the increase of Baffle Spaces; however, for the same pressure drop, the most extended Baffle Space (Case E) obtains higher heat transfer. We also found out that the pressure gradient decreases with the increase of Baffles Space.
A Bousri - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of convective heat transfer in an open cell aluminum foams
Experimental Thermal and Fluid Science, 2016Co-Authors: Abdelmalek Hamadouche, Rachid Nebbali, H Benahmed, A Kouidri, A BousriAbstract:Abstract Experimental results of heat transfer and pressure drop for a three open-cell aluminum foam blocks are presented for turbulent forced convection. The aluminum foam samples are inserted in a rectangular channel in a staggered manner on its bottom and top walls. A constant heat flux of 2 W/cm 2 is maintained in the test section on the bottom wall. The wall temperatures along the flow direction as well as the average inlet and outlet temperatures of the air were measured. Measurements of pressure drop across the aluminum foam sample with a grade of 40 PPI and a porosity of 93% in a blower were used to determine the intrinsic properties of this foam and to allow the determination of its permeability and inertial coefficient. The air velocity was varied from 1 to 5 m s −1 while two heights of the porous blocks respectively 16 mm and 20 mm were used. Additionally a configuration of solid blocks made of aluminum was investigated. The results show that inserting metallic foams in a turbulent air flow improves the heat transfer by approximately 300% compared with an empty channel with adopting lower velocity, which reduces the supplied power. This improvement is even more important as the sample height is great. Increasing the sample size of the metallic foam, accentuate the turbulent kinetic energy levels inside the porous matrix and into the inter-Baffle Space, which increased the heat dissipated in the wall. In addition, the use of metallic foam increased the thermal conductivity of the coolant. Finally, compared with solid Baffles, the aluminum foam created lower pressure losses because of their permeability and dissipate 2 times more heat.
