Optimization of Heat Transfer in Oil Tank of Wall Heat Exchanger
To address the issue of the influence of the lubricating oil coagulating into a solid during use at low temperatures,a study on the phase change heat transfer and strengthening of the lubricating oil in the oil tank was conducted.A one-dimensional model of phase change heat transfer for heating and solidifying lubricating oil was established based on heat transfer theory by experimentally measuring the temperature field distribution of lubricating oil when heated.A more reasonable arrangement of heat exchange tubes was calculated.The results indicate that the relative error between the calculations of the one-dimensional heat transfer model and the ex-perimental results is within 5%,proving that the model can be used for subsequent research.The density of solid-phase lubricating oil is greater than that of liquid-phase lubricating oil.The temperature of the lubricating oil exhibits a gradually increasing trend in the vertical cross-section of the oil tank from the bottom to the top height position.Arranging the heat exchange tubes in the middle of the oil tank can make the heating of the lubricating oil more thorough,while horizontally arranging the heat exchange tubes can make the heating of the lubricating oil more uniform.Arranging the heat exchange tubes vertically will cause the phase change distribution area of the lubricating oil to exhibit a significant directionality,and the lubricating oil directly above the heat exchanger tubes will melt at a faster rate.The inclination angle of the heat exchanger tube within 19°can improve the melt-ing rate of the lubricating oil while exceeding the critical angle of 19° is not conducive to heat transfer.Placing heat transfer tubes in an inverted'Y'shape can reduce the time taken for solid-phase lubricating oil to com-pletely melt into the liquid phase,which is 20%shorter than that of single-row arrangements and 41.6%shor-ter than that of double-row arrangements.Changing the arrangement of heat exchanger tube can effectively in-crease the melting rate of solidified lubricating oil and reduce the consumption of time and energy.
solidified lubricantphase changearray modenumerical simulationenhanced heat transfer
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