叶轮起旋水合物管道螺旋流动及传热数值模拟
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摘要
为了进一步研究输气管道中天然气水合物颗粒输送体系的螺旋悬浮流动规律,建立了圆管螺旋流的三维模型。采用RNG k-ε模型和DPM模型对天然气管道内的气固两相螺旋流动和传热进行了三维瞬态数值模拟。主要研究了水合物管道内不同横截面的速度场、壁面剪切力、水合物颗粒停留时间、水合物颗粒浓度分布规律以及传热规律。研究结果表明:螺旋流具有较强的颗粒携带能力,对增强水合物颗粒之间的传热,防治输气管道中水合物堵塞问题有较好的效果。研究结果可为保障输气管道的安全输送提供理论指导。
The spiral suspension flow of gas hydrate particles transportation system in gas pipeline is further studied by establishing a three-dimensional model of spiral flow in round pipe. The RNG k-ε model and DPM model are used to conduct three-dimensional transient numerical simulation on gas-solid two-phase spiral flow and heat transfer in natural gas pipeline. The velocity field,wall shear force,dwell time of hydrate particles,concentration distribution of hydrate particles and heat transfer are mainly studied at different cross sections of hydrate pipeline.The results of numerical simulation show that the spiral flow has strong particle carrying capacity,which has positive effect on enhancing the heat transfer between hydrate particles and preventing the plugging of hydrate in the gas pipeline. The study provides a theoretical guidance to the running safety of gas pipeline.
The spiral suspension flow of gas hydrate particles transportation system in gas pipeline is further studied by establishing a three-dimensional model of spiral flow in round pipe. The RNG k-ε model and DPM model are used to conduct three-dimensional transient numerical simulation on gas-solid two-phase spiral flow and heat transfer in natural gas pipeline. The velocity field,wall shear force,dwell time of hydrate particles,concentration distribution of hydrate particles and heat transfer are mainly studied at different cross sections of hydrate pipeline.The results of numerical simulation show that the spiral flow has strong particle carrying capacity,which has positive effect on enhancing the heat transfer between hydrate particles and preventing the plugging of hydrate in the gas pipeline. The study provides a theoretical guidance to the running safety of gas pipeline.
引文
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[2]DURMU爦A,DURMU爦A,ESEN M.Investigation of heat transfer and pressure drop in a concentric heat exchanger with snail entrance[J].Apply Thermal Engineering,2002,22(3):321-332.
[3]BERGLES A E,JENSEN M K,SHOME B.The literature on enhancement of convective heat and mass transfer[J].Journal of Enhanced Heat Transfer,1996,4(1):1-6.
[4]ZHANG J W,ZHANG Z.Numerical study on fully developed fluid flow and heat transfer in a spiral finned tube[J].Chinese Journal of Chemical Engineering,1999,7(1):56-66.
[5]陈鹏,刘福旺,李玉星,等.水合物浆液流动特性数值模拟[J].油气储运,2014,33(2):160-164.CHEN P,LIU F W,LI Y X,et al.Numerical simulation of hydrate slurry flow behavior[J].Oil&Gas Storage and Transportation,2014,33(2):160-164.
[6]饶永超,王树立,代文杰,等.天然气水合物浆体流变性与安全流动边界研究进展[J].化工进展,2015,34(10):3551-3556.RAO Y C,WANG S L,DAI W J,et al.Research progress on slurry rheological properties and security flow boundary of natural gas hydrate[J].Chemical Industry and Engineering Progress,2015,34(10):3551-3556.
[7]刘雯,程小莉,陈勇,等.管内螺旋导流板引发的气液两相旋流场[J].机械工程学报,2013,49(22):164-168.LIU W,CHENG X L,CHEN Y,et al.Gas-liquid swirling flow induced by helical tape with core-rod inside circular pipe[J].Journal of Mechanical Engineering,2013,49(22):164-168.
[8]王树立,饶永超,张琳,等.水平管内螺旋流流动特性研究现状与进展[J].太原理工大学学报,2013,44(2):232-236.WANG S L,RAO Y C,ZHANG L,et al.Research situation and progress on flow characteristics of spiral flow in horizontal pipe[J].Journal of Taiyuan University of Technology,2013,44(2):232-236.
[9]王树立,饶永超,韩永嘉,等.螺旋流发生装置的对比分析研究[J].流体机械,2013,41(2):30-38.WANG S L,RAO Y C,HAN Y J,et al.Comparative analysis and research on spiral flow generator[J].Fluid Machinery,2013,41(2):30-38.
[10]WANG W C,FAN S S,LIANG D Q,et al.Experimental study on flow characteristics of tetrahydrofuran hydrate slurry in pipelines[J].Journal of Natural Gas Chemistry,2010,19(3):318-322.
[11]王武昌,陈鹏,李玉星,等.天然气水合物浆在管道中的流动沉积特性[J].天然气工业,2014,34(2):99-104.WANG W C,CHEN P,LI Y X,et al.Flow and deposition characteristics of natural gas hydrate in pipelines[J].Natural Gas Industry,2014,34(2):99-104.
[12]WONGCHAREE K,EIAMSA-ARD S.Friction and heat transfer characteristics of laminar swirl flow through the round tubes inserted with alternate clockwise and counter-clockwise twisted-tapes[J].International Communications in Heatand Mass Transfer,2011,38(3):348-352.
[13]ZOHIR A E,ABDEL-AZIZ A A,HABIB M A.Heat transfer characteristics in a sudden expansion pipe equipped with swirl generators[J].International Journal of Heat and Fluid Flow,2011,32(1):352-361.
[14]张琳,钱红卫,宣益民,等.自转螺旋扭带管内三维流动与传热数值模拟[J].化工学报,2005,56(9):1633-1638.ZHANG L,QIAN H W,XUAN Y M,et al.3D numerical simulation of fluid flow and heat transfer in self-rotating twisted-tape-inserted tube[J].Journal of Chemical Industry and Engineering(China),2005,56(9):1633-1638.
[15]BHUIYA M M K,CHOWDHURY M S U,SHAHABUDDIN M,et al.Thermal characteristics in a heat exchanger tube fitted with triple twisted tape inserts[J].International Communications in Heat and Mass Transfer,2013,48:124-132.