Numerical simulation plate side flow heat transfer new plate-shell heat exchanger with considering physical property changes and shell heat transfer

doi:10.16085/j.issn.1000-6613.2023-0890

Abstract

Abstract:

With superior heat transfer performance and temperature and pressure resistance, plate-shell heat exchangers have broad application prospects in chemical production and other fields. Utilizing the realizable $k ⁃ ε$ turbulence model combined with the enhanced wall function, a numerical simulation study was carried out on the plate side flow and heat transfer characteristics of a new type of plate-shell heat exchanger. The change of medium physical properties with temperature and the influence of shell heat transfer on heat transfer performance were discussed, and the fitting correlation formula obtained from existing experiments was verified. The flow and heat transfer characteristics of different corrugation heights at different inlet flow velocities were analyzed emphatically. At the same time, based on the field synergy principle, the synergy between the velocity field and the temperature field, and the field synergy angle distribution of the velocity field and the pressure field were revealed. The results showed that the flow and heat transfer of the heat exchanger couldnot ignore the influence of the change of the fluid medium‍’‍s physical properties and the heat transfer of the shell. With increased corrugation’‍s inclination height, the fluid flow line changed from “longitudinal flow” to “crossflow”. The distribution tended to be uniform and the heat transfer performance was improved. Continuous vortex structures were formed along the crests and troughs, and a periodic, centrally symmetrical high-shear vorticity concentration zone was formed around the contact point. The local field perpendicular to the flow direction synergistically presented a periodic variation, and the higher the corrugation height, the more pronounced the periodicity. Although the field synergy performance increased with the increase of the corrugation height, the fluid flow state changed with the increase of the flow velocity, and the flow in the core area of the corrugated channel was similar to the heat flow, which made the degree of synergy worse.

Key words: plate-shell heat exchanger, corrugated height, three field synergy principle, flow and heat transfer, numerical simulation

摘要：

板壳式换热器以优越的换热性能和耐温耐压性在化工生产等领域有着广阔的应用前景。本文采用可实现 $k ⁃ ε$ 湍流模型结合增强壁面函数，对一种新型板壳式换热器板程流动与传热特性进行数值模拟研究，讨论了介质物性变化及壳体传热的影响，并与已有实验进行验证。重点分析了不同波纹高度在不同入口流速下的流动传热特性，基于场协同理论揭示了速度场与温度场及压强场协同分布规律。结果表明：流动传热计算不能忽略流体介质物性变化及壳体传热的影响；增大波纹高度流态由曲折流向十字交叉流转变，板间流体分布趋于均匀，换热性能增大；沿沟槽形成连续的涡结构，在触点周围形成具有周期性和中心对称的高剪切涡量集中区，垂直于流动方向场协同呈现周期性变化，波纹高度越高周期性越明显；在波纹核心流域内因流动与热流相似，其协同程度变差。

关键词: 板壳式换热器, 波纹高度, 三场协同, 流动传热, 数值模拟

CLC Number:

TK172

SUN Chao, AI Shiqin, LIU Yuechan. Numerical simulation plate side flow heat transfer new plate-shell heat exchanger with considering physical property changes and shell heat transfer[J]. Chemical Industry and Engineering Progress, 2024, 43(4): 1676-1689.

孙超, 艾诗钦, 刘月婵. 考虑物性变化及壳体传热的新型板壳式换热器板程流动传热数值模拟[J]. 化工进展, 2024, 43(4): 1676-1689.

Figures/Tables 22

参数	尺寸/mm	参数	尺寸/mm
波纹板外径	440	R1	320
流体入口直径	80	R2	80
波纹高度(b)	2.5	R3	440
波纹节距(a)	11	R4	80
倾斜角(β)	45°	R5	320
内径与外径边距	20	板流道高度	5.2

波纹高/mm	波纹量纲为1 参数 $δ$	$Γ$ 面积扩大因子	水力直径D_h/mm	壁面传热面积/m²	垂直于流动方向x=0 截面速度/m·s^-1	波纹板体积温度/K	壁面平均温度/K
1.5	0.857	1.17	2.6	0.069	0.455	313.70	305.12
2.0	1.142	1.28	3.1	0.072	0.365	313.86	304.98
2.5	1.428	1.40	3.6	0.074	0.312	313.98	304.87
3.0	1.734	1.56	3.8	0.077	0.276	314.13	304.75
3.5	2.000	1.69	4.1	0.080	0.248	314.30	304.58

波纹高/mm	波纹量纲为1 参数 $δ$	$Γ$ 面积扩大因子	水力直径D_h/mm	壁面传热面积/m²	垂直于流动方向x=0 截面速度/m·s^-1	波纹板体积温度/K	壁面平均温度/K
1.5	0.857	1.17	2.6	0.069	0.455	313.70	305.12
2.0	1.142	1.28	3.1	0.072	0.365	313.86	304.98
2.5	1.428	1.40	3.6	0.074	0.312	313.98	304.87
3.0	1.734	1.56	3.8	0.077	0.276	314.13	304.75
3.5	2.000	1.69	4.1	0.080	0.248	314.30	304.58

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