Experimental Research And Numerical Simulation On Heat Transfer Performance Of Oscillating Heat Pipe Unit For Grinding Wheel

The technology of heat pipe grinding wheel provides a new method to solve the grinding burns problem in the high-efficiency grinding process of difficult-to-machine materials.However,the existing heat pipe grinding wheel has many problems such as sensitivity to centrifugal force,poor processing adaptability to complex surface and unstable heat transfer enhancement ability,which restrict the development and application of the heat pipe grinding wheel technology.On the basis of the existing heat pipe grinding wheel,this paper introduces the oscillating heat pipe technology and puts forward the idea of the axial rotating oscillating heat pipe grinding wheel.A series of experiments and simulations on the heat transfer performance were carried out based on the oscillating heat pipe unit,which is the key component of the axial rotating oscillating heat pipe grinding wheel.The major research work is as follows:(1)The temperature variation characteristics of the evaporation section and the condensation section of the oscillating heat pipe unit under different working fluids were explored by the heat transfer performance experiments,and the effects of tube diameter,working fluids and heat flux density on the heat transfer performance were investigated.Through the visual experiments,the motion and flow pattern shift of vapor-liquid slug during the operation of oscillating heat pipe unit were analyzed.(2)The effects of various factors on the heat transfer performance of oscillating heat pipe unit were further explored through the simulation of heat transfer performance,and the accuracy of the simulation model was verified by comparison with the experiments.Based on the experiment and simulation results,the optimal tube diameter and working fluid of oscillating heat pipe unit were obtained.In addition,the phase transition process and heat transfer mechanism in the oscillating heat pipe unit were investigated by flow field analysis.(3)As for the oscillating heat pipe unit with definite tube diameter and working fluid,the variation trend of the temperature of the evaporation section with the convective heat transfer coefficient of the condensation section under different heat flux density was investigated by simulation.And the range of the cooling parameters of the condensation section which can control the temperature of the evaporation section effectively was obtained.