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Numerical Simulation of Heat Transfer Characteristics of Trisection Helical Baffles Heat Exchanger

Author: HuangZuo
Tutor: ZhaoJianHui
School: Xi'an University of Science and Technology
Course: Heating,Gas Supply, Ventilation and Air Conditioning Engineering
Keywords: Trisection helical baffles Heat exchanger Helix angle Numerical simulation
CLC: TK172
Type: Master's thesis
Year: 2013
Downloads: 24
Quote: 0
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Abstract


The heat exchanger is an important unit in the chemical production equipment, thetonnage of the heat exchanger approximately20%of the entire process equipment, some evenhigher, the importance can be imagined. Currently, the most widely used heat exchanger is ashell and tube heat exchanger. In addition, plate heat exchangers, plate-fin heat exchanger,spiral plate heat exchanger. This article by structural improvement of the traditional spiralplate heat exchanger, to change the layout of the shell side baffles, baffles trisect symmetricpartitions proposed trisection helical baffles heat exchanger. The improved heat exchangerbecause of having special structural characteristics, so that heat exchange efficiency isimproved than before.This paper studies the trisection helical baffles heat exchanger, using different helixangle of10°,15°,20°,30°and40°. The five different angles of heat exchanger to create amathematical model. Different mass flow, heat transfer coefficient on the shell side of theheat exchanger, pressure drop, radial velocity, heat transfer due to entropy production to besimulated.In the case of the same mass flow, shell-side heat transfer coefficient and pressure lossare increased with the reduction of the helix angle, and the voltage drop reduces the amplitudeof the helix angle is smaller than the heat transfer coefficient greater derived by numericalsimulation; the trisection helical Baffles the Heat exchanger shell cross section of the velocitydistribution in the small angle variation is relatively large, while as the angle increases moreuniform; in a region near the centre of the housing, the speed of the same radial position withthe spiral the reduction of the angle is increased, then decreased as the helix angle increasesnear the housing wall; exchange of heat between the heat pipes of different radial positions inthe helix angle is smaller, the distribution of irregular, with teach increase in the degree ofuniformity of the distribution getting better and better; shell-way traffic at the same time, theratio of heat transfer entropy production and the total entropy production decreases with increasing helix angle entropy generation number with the increase in the angle of the spiralreduced.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Industrial thermal equipment > Heat Transfer Equipment
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