Research About Heat Transfer And Thermal Mixing For Heat Transfer Enhancement Of Plate Heat Exchanger Based On Field Synergy Principle

Plate heat exchanger is a kind of heat-exchange equipment that takes corrugated board as the heat transfer surface and use convection and heat conduction as the main mean. Plate heat exchanger has a high heat coefficient. Plate heat exchanger has complex flow pass shapes and various plate forms, the traditional experimental methods is difficult to meet the requirements of the more and more complex application conditions. The study use the field synergy principle created by Guo Zengyuan and take numerical simulation method to analyze plate heat exchanger's heat transfer characteristics can get the heat transfer results of multi-group models under various setting conditions in a short period of time, greatly reducing the experiment cost and experiment time.According to the three main parameters of traditional herringbone corrugated plate heat exchanger channels, build multi-group physical models, for the corrugated plate heat exchanger's inside channels whose wave angle ?=30°?80°, wave height h= 3mm?8mm, wave spacing ?= 10mm?30mm to calculate by numerical simulation, get the velocity contour and temperature gradient contour under different conditions, obtain the key numerical value in the boundary and flow of the simulation results. Calculate the cosine of angle of velocity and temperature gradient, use the field synergy principle to draw the corresponding curves and analyze the effect of the three main parameters of corrugated plate on the heat exchanger performance. The conclusions are as follows:with the increasing of wave angle ?, the performance of heat transfer shows the trend that strengthens at the first then weakens. When the wave angle ?= 60°, the heat transfer performance is the best. With the increasing of the wave height h, the performance of heat transfer shows the trend that gradually strengthens. With the increasing of the wave spacing ?, the performance of heat transfer shows the trend that gradually weakens.Based on the theory of thermal mixing, take different angle combination ?1-?2 as the variables, and take H-type, M-type and L-type thermal mixing as the object for numerical simulation, get the velocity contour and temperature gradient contour under different conditions, obtain the key numerical value in the boundary and flow of the simulation results. Calculate the cosine of angle of velocity and temperature gradient, use the field synergy principle to draw the corresponding curves and analyze the effect of the three main parameters of corrugated plate on the heat exchanger performance, compare with the curve of single plate whose wave angle ?= 60°, and analyze the impact of various thermal mixing conditions on the heat exchanger performance. The conclusions are as follows:through another way to apply the conclusion about the effort of the wave angle to the heat transfer performance. With the increasing of wave angle ?, the performance of heat transfer shows the trend that strengthens at the first then weakens. Need to be attention, thermal mixing is a kind of middle-group application method, not an absolute optimal, so the specific application needs to choose according to the working requirement.