Distribution Characteristics Analysis on Two-phase Flow of Natural Gas in PCHE Fine Multi-channels
Printed circuit plate heat exchanger has the characteristics of small size,compact structure,and high heat transfer efficiency,which has an excellent prospect for application in natural gas production technology,during the heat transfer process of PCHE,the boiling phase change of the work material often occurs in the channel of the cold and hot side,and the uneven distribution of gas-liquid two-phase flow pre-vails among the sub-channels,which seriously reduces the heat transfer efficiency.In this paper,numerical models are developed for the pre-diction and analysis on the distribution characteristics on two-phase flow of natural gas in the PCHE,using the exchanger head and 12 small channels as the modeling objects and taking the natural gas-liquid two-phase mixture as the working medium,obtaining its physical properties data by Aspen Plus software,and tracking the phase interface motion based on the VOF model.The results show that when the heat exchanger inlet is changed to a gas-liquid two-phase mixture compared to a single-phase liquid natural gas,the relative standard deviation of the mass flow rate of the work mass between the sub-channels increased from 0.000 4 to 0.036,which is nearly a 100 times difference,and the uneven distribution phenomenon increased significantly.The main reason for this phenomenon is that the incoming gas phase mass flow tends to enter the nearest channels of the heat exchanger inlet,which makes the gas phase flow in these channels significantly higher than other channels,and the overall gas phase mass flow distribution characteristics of the channels show a clear"peak distribution",however,with the increasing flow rate of the gas-phase at the inlet of the heat exchanger,the distribution unevenness of the gas-phase mass flow among the channels is grad-ually moderated,while the liquid-phase mass flow distribution characteristics deteriorate significantly.
printed circuit heat exchangerparallel fine multi-channelsnatural gasgas-liquid two-phase flowflow distribution
万方数据
维普
