氮气在微米管中的微尺度流动端面效应  

EXPERIMENTAL STUDY ON FACTORS AFFECTING THE END EFFECT FOR NITROGEN FLOW IN MICRO TUBE

作　　者：方欣 廖海婴[1] 岳湘安[2] FANG Xin;LIAO Haiying;YUE Xiang'an(SINOPEC Petroleum Exploration&Production Research Institute,Beijing 102206,China;School of Petroleum Engineering,China University of Petroleum,Beijing,Beijing 102249,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京102206 [2]中国石油大学(北京)石油工程学院,北京102249

出　　处：《力学与实践》2023年第6期1375-1381,共7页Mechanics in Engineering

摘　　要：在压力为5~20 MPa、温度为25~60℃范围内,开展了氮气在直径31~100μm管中的流动实验。提出了用于量化微尺度流动端面效应附加压差Δ_(pend)的双管长压差计算法。利用该方法,基于实验结果发现:Δ_(pend)与管径d负相关,而与流速v正相关。在低流速条件下压力对Δ_(pend)的影响不明显,而在高流速条件下Δ_(pend)随压力的升高而增大;在本文实验条件内,温度对Δ_(pend)的影响不明显。据此,建立了综合表征Δ_(pend)与d和v关系的微尺度流动端面附加压差的经验模型。In this work,we studied factors affecting the end effect in microtubes by conducting nitrogen microscale flow experiments in 31~100μm tubes under the conditions of 5~20 MPa and 25~60℃.We proposed the double tube-length differential pressure calculation method for end-effects induced additional differential pressureΔ_(pend).Using this method,it is found that there is a negative correlation betweenΔ_(pend)and tube diameter d,andΔ_(pend)increases monotonically with the flow velocity v.The effect of pressure onΔ_(pend)is not significant under low flow rate conditions,howeverΔ_(pend)increases with increasing pressure under high flow rate conditions.Under the experimental conditions in this paper,temperature has little effect onΔ_(pend).Finally,we established an empirical model to describe the relationship betweenΔ_(pend)and v,d.

关 键 词：微尺度流动 端面效应 端面附加压差 石英微管 

分 类 号：O351.2[理学—流体力学]