Analysis of heat transfer and resistance performance of U-shaped baffle heat exchanger

doi:10.16085/j.issn.1000-6613.2021-1633

Abstract

Abstract:

Periodic whole cross-section models of U-shaped baffle heat exchanger and torsional flow heat exchanger were established, and the shell side performance of two heat exchangers was numerically studied by using computational fluid dynamics(CFD) method. Compared with the torsional flow heat exchanger, the results showed that the pressure drop in the shell side of the U-shaped baffle heat exchanger was reduced by 45.3%—47.5%, the heat transfer coefficient was reduced by 9.9%—13.5%, the uniformity was improved by 2.4%—4.0%, and the comprehensive performance was improved by 4.0%—14.6%. The field synergy results showed that the synergy of fluid velocity and pressure gradient in the shell side of U-shaped baffle heat exchanger was superior to that of the torsional flow heat exchanger, while the synergy of fluid velocity and temperature gradient was not as good as that of the torsional flow heat exchanger. The Laser Doppler Velocimeter (LDV) experiment verifies the accuracy of the simulation method and the reliability of the simulation results. The influence of U-shaped baffle structure parameters and arrangement on the pressure drop and heat transfer performance of the heat exchanger shell side is studied. The results show that the angle and arrangement of the baffles have a significant impact on the performance, while the width and spacing of baffles have little impact.

Key words: U-shaped baffle, shell and tube heat exchanger, computational fluid dynamics(CFD), numerical simulation

摘要：

建立U形导流板换热器和扭转流换热器全截面周期模型，利用计算流体力学（CFD）方法对两种换热器壳程性能进行数值研究。相较于扭转流换热器，U形导流板换热器的壳程压降降低45.3%~47.5%，传热系数降低9.9%~13.5%，均匀性提高2.4%~4.0%，综合性能提高4.0%~14.6%。场协同结果表明，U形导流板换热器壳程流体速度与压力梯度的协同性优于扭转流换热器，而流体速度与温度梯度的协同性不如扭转流换热器。本文利用激光多普勒测速仪（LDV）验证了模拟方法准确性和模拟结果的可靠性；分析了U形导流板结构参数及布置方式对换热器壳程压降和传热性能的影响。结果表明，U形导流板的布置角度和布置方式对性能影响显著，导流板宽度和导流板间距的影响较小。

关键词: U形导流板, 管壳式换热器, 计算流体力学, 数值模拟

CLC Number:

TK 124

GU Xin, ZHANG Qianxin, WANG Chaopeng, FANG Yunge, LI Ning, WANG Yongqing. Analysis of heat transfer and resistance performance of U-shaped baffle heat exchanger[J]. Chemical Industry and Engineering Progress, 2022, 41(7): 3465-3474.

古新, 张前欣, 王超鹏, 方运阁, 李宁, 王永庆. U形导流板换热器传热和阻力性能分析[J]. 化工进展, 2022, 41(7): 3465-3474.

Figures/Tables 20

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网格大小/mm	压降/Pa·m^-1	误差/%	传热系数/W·m^-2·K^-1	误差
5	954.1	—	2278.8	—
4	974.5	2.1	2292.5	0.6
3	985.6	1.1	2297.8	0.2
2	992.2	0.7	2275.5	0.9

网格大小/mm	压降/Pa·m^-1	误差/%	传热系数/W·m^-2·K^-1	误差
5	954.1	—	2278.8	—
4	974.5	2.1	2292.5	0.6
3	985.6	1.1	2297.8	0.2
2	992.2	0.7	2275.5	0.9

M/kg·s^-1	U形导流板换热器			扭转流换热器
M/kg·s^-1	Δp/Pa·m^-1	h/W·m^-2·K^-1	Nu/f^1/3	Δp/Pa·m^-1	h/W·m^-2·K^-1	Nu/f^1/3
1.4	545.5	1960.7	50.9	992.2	2275.5	41.7
2.1	1189	2765.9	72.5	2266.6	3268.1	68.0
2.81	2094.4	3613.2	95.8	4156.4	4184.4	86.6
3.51	3239.9	4454.3	119.4	5975.3	5056.7	107.6
4.21	4661.8	5278.3	141.5	8596.3	5897.5	126.2

M/kg·s^-1	U形导流板换热器			扭转流换热器
M/kg·s^-1	Δp/Pa·m^-1	h/W·m^-2·K^-1	Nu/f^1/3	Δp/Pa·m^-1	h/W·m^-2·K^-1	Nu/f^1/3
1.4	545.5	1960.7	50.9	992.2	2275.5	41.7
2.1	1189	2765.9	72.5	2266.6	3268.1	68.0
2.81	2094.4	3613.2	95.8	4156.4	4184.4	86.6
3.51	3239.9	4454.3	119.4	5975.3	5056.7	107.6
4.21	4661.8	5278.3	141.5	8596.3	5897.5	126.2

试验	角度/（°）	间距/mm	宽度/mm	布置方式	Δp/Pa·m^-1	h/W·m^-2·K^-1
1	30	80	50	平行布置	1828.66	2806.07
2	30	100	90	对折布置	7637.88	4178.98
3	30	120	70	旋转布置	1563.35	2555.43
4	45	80	90	旋转布置	599.69	2044.33
5	45	100	70	平行布置	536.18	1955.49
6	45	120	50	对折布置	1563.8	2876.81
7	60	80	70	对折布置	964.47	2563.93
8	60	100	50	旋转布置	159.99	1437.52
9	60	120	90	平行布置	218.98	1748.42