|
|
- 2018
T型管内两相流分配特性数值模拟
|
Abstract:
摘要： T型管内气液两相流分配不均易导致换热器偏流和受热不均。为了优化T型管内气液两相流流动,以FLUENT为模拟软件,以流体流动参数和管子几何结构为研究变量,对T型管内流体流动进行数值模拟。发现流体入口液相体积分数越大,入口速度越小,液滴粒径越小,越利于流体均布;同时支管衔接处采取弯管结构较直管结构优越,其中入口速度对流体分布影响最明显,速度相差3个数值即可优化两个出口液相体积分数比差10%左右。结果表明,相应改变流体流动参数和管子几何结构能有效优化T型管内流体流动。
Abstract: Uneven distribution of gas-liquid two-phase flow in T-tube was easy to cause bias flow and uneven heating in heat exchangers. To optimize the gas-liquid two-phase flow in T-tube, the simulation about influences of flow parameters and tubes geometric structure on distribution of two-phase flow characteristics in T-tube was carried out by FLUENT. It was found that higher volume fraction of liquid phase and slower inlet velocity, and a smaller diameter of liquid drops facilitate even distribution of fluid. Meanwhile, the elbow structure was better than a straight tube at joints of branch tubes, the inlet velocity had most obvious influence on flow distribution, the difference of three units in speed could result in around 10% variation in volume fraction ration between two outlets. The results showed that change the flow parameters and tubes geometric structure correspond could optimize fluid flow in T-tube effectively
| [1] | MASAHIRO O, TOMOYUKI H, SACHIYO H. Water flow distribution in horizontal header contaminated with bubbles[J]. International Journal of Multiphase Flow, 1999, 25(5):827-840. |
| [2] | CHARRON Y, WHALLEY P B. Gas-liquid annular flow at a vertical tee junction-part flow separation[J]. Multiphase Flow, 1995, 21(4):569-589. |
| [3] | CHIOU J P. The effect of longitudinal heat conduction on crossflow heat exchanger[J]. Journal of Heat Transfer, 1978, 100(2):346-351. |
| [4] | SAAD S B, CLEMENT P, FOURMIGUE J F, et al. Single phase pressure drop and two-phase distribution in an offset strip fin compact heat exchanger[J]. Applied Thermal Engineering, 2002, 49(6):99-105. |
| [5] | 罗永浩,杨世铭,王孟浩.T型进口三通对分配联箱流量分配的影响[J].动力工程,1998,18(3):29-33. LUO Yonghao, YANG Shiming, WANG Menghao. The influence of T-tube on distribution of flux in distribution header[J]. Power Engineering, 1998, 18(3):29-33. |
| [6] | 缪正清,徐通模.集箱与并联管屏系统单相流体的流动特性[J].上海交通大学学报,2000,34(9):1206-1210. MIU Zhengqing, XU Tongmo. The fluid flow characteristics of single phase in header and parallel tube system[J]. Journal of Shanghai JiaoTong University, 2000, 34(9):1206-1210. |
| [7] | CHIOU J P. The effect of nonuniform fluid flow distribution on the thermal performance of solar collector[J]. Solar Energy, 1982, 29(6):487-502. |
| [8] | 赵铎.水平管内气液两相流流型数值模拟与实验研究[D].青岛:中国石油大学,2007. ZHAO Duo. Numerical simulation and experimental research on flow pattern of gas-liquid flow in horizontal pipe[D]. Qingdao: China University of Petroleum, 2007. |
| [9] | MULLER-MENZEL T. Plate-fin heat exchanger performance reduction in special two-phase flow conditions[J]. Cryogenics, 1995, 35(5):297-301. |
| [10] | WANG C C, YANG K S, TSAI J S, et al. Characteristics of flow distribution in compact parallel flow heat exchangers part I: typical inlet header[J]. Applied Thermal Engineering, 2011, 31:3226-3242. |
| [11] | 陶文铨. 数值传热学[M]. 西安:西安交通大学出版社, 2001: 1-6. |
| [12] | ECKHARD K, BRAHMA N, ALEXANDR Z, et al. Experimental and numerical studies of volume fraction distribution in rectangular bubble columns[J]. Nuclear Engineering and Design, 2007, 237(4):399-408. |
| [13] | MUELLER A C, CHIOU J P. Review of various types of flow maldistribution in heat exchanger[J]. Heat Transfer Engineering, 1988, 9(2):36-50. |
| [14] | SIVERT V. Two-phase flow distribution in heat exchanger mainfolds[D]. Trondheim, Norway: Norwegian University of Science and Technology, 2003. |
| [15] | 罗永浩,杨世铭.锅炉集箱支管流动机理探讨[J].锅炉技术,1997(4):11-13. LUO Yonghao, YANG Shiming. The flow mechanism of boiler header pipe[J]. Boiler Technology, 1997(4): 11-13. |
| [16] | 李亚洁.分配联箱气液两相流的实验及数值模拟研究[D].北京:华北电力大学.2009. LI Yajie. Experimental investigation and numerical simulation on gas-liquid two phase flow in distribution header[D]. Beijing: North China Electric Power University, 2009. |
| [17] | MUELLER A C. Effects of some types of maldistribution on the performance of heat exchangers[J]. Heat Transfer Engineering,1987, 8(2):75-86. |
| [18] | MOHAMMAD A, GEORGES B, PIERRE M. General characteristics of two-phase flow distribution in a compact heat exchanger[J]. International Journal of Heat and Mass Transfer, 2009, 52(1-2):442-450. |
| [19] | 杨康,刘吉普,马雯波.基于FLUENT软件的T型三通管湍流数值模拟[J].化工装备技术, 2008, 29(4):33-36. YANG Kang, LIU Jipu, MA Wenbo. The turbulence numerical simulation of T-tube based on FLUENT software[J]. Chemical Equipment Technology, 2008, 29(4):33-36. |
| [20] | CHIOU J P. Thermal performance deterioration in crossflow heat exchanger due to the flow nonuniformity [J]. Journal of Heat Transfer, 1978, 100(4):580-587. |
