不同几何参数竖直蛇形管内超临界压力CO2流动与换热数值模拟

黄腾, 李雪芳, 柯道友, 巴清心, 程林

清华大学学报（自然科学版） ›› 2020, Vol. 60 ›› Issue (3) : 263-270.

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清华大学学报（自然科学版） ›› 2020, Vol. 60 ›› Issue (3) : 263-270. DOI: 10.16511/j.cnki.qhdxxb.2019.21.031
核能与新能源工程

不同几何参数竖直蛇形管内超临界压力CO2流动与换热数值模拟

  • 黄腾1, 李雪芳1, 柯道友2, 巴清心1, 程林1
作者信息 +

Numerical study of the flow and heat transfer of supercritical CO2 flowing in various vertical serpentine tubes

  • HUANG Teng1, LI Xuefang1, CHRISTOPHER D M2, BA Qingxin1, CHENG Lin1
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文章历史 +

摘要

作为一种环境友好型自然工质，CO2被越来越多地应用于热泵系统。该文通过模拟超临界压力CO2在竖直蛇形管中的流动和传热过程，分析了蛇形管几何参数对其换热性能的影响，并探究超临界压力CO2在不同尺寸蛇形管中流动的强化传热机制。建立了12种不同内径和曲率直径组合的蛇形管模型，以探究在给定质量流率条件下，不同内径和曲率直径对超临界压力CO2流动换热性能的影响。结果表明：曲率直径或内径的增大，均会导致传热系数降低；蛇形管内径越大，外壁面温升及温度波动幅度均越大；蛇形管曲率直径越大，外壁温度越高。最后，研究了流动方向对传热性能的影响，发现当内径大于1 mm时，蛇形管换热性能在工质向下流动时优于在工质向上流动时。本文可以为相关换热器的优化设计提供参考，从而提高换热效率和系统性能。

Abstract

As an environmentally friendly natural refrigerant, CO2 has been increasingly used as the working fluid in heat pumps. The flow and heat transfer of supercritical CO2 flowing in various serpentine tubes were modeled here to investigate the influence of the tube geometry on the heat transfer and to investigate the heat transfer enhancement mechanisms. Twelve full-size three-dimensional geometries were generated with different inner diameters and bend diameters to investigate the effects of the tube inner diameter and bend diameter on the flow and heat transfer of supercritical CO2 for a given flow flux. The results show that the heat transfer coefficient decreases as both the bend diameter and the inner diameter decrease. Thus, the outer wall temperature increases more rapidly and is higher with larger inner diameters and tube bend diameters. Finally, the effects of flow direction on the heat transfer were also studied to show that upward flow results in a higher heat transfer coefficient than downward flow for inner diameters larger than 1 mm. The present results are useful for enhanced heat exchanger designs to improve system efficiencies.

关键词

对流换热 / 超临界二氧化碳 / 蛇形管 / 管型

Key words

convective heat transfer / supercritical CO2 / serpentine tubes / tube shape

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黄腾, 李雪芳, 柯道友, 巴清心, 程林. 不同几何参数竖直蛇形管内超临界压力CO2流动与换热数值模拟[J]. 清华大学学报（自然科学版）. 2020, 60(3): 263-270 https://doi.org/10.16511/j.cnki.qhdxxb.2019.21.031
HUANG Teng, LI Xuefang, CHRISTOPHER D M, BA Qingxin, CHENG Lin. Numerical study of the flow and heat transfer of supercritical CO2 flowing in various vertical serpentine tubes[J]. Journal of Tsinghua University(Science and Technology). 2020, 60(3): 263-270 https://doi.org/10.16511/j.cnki.qhdxxb.2019.21.031

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基金

山东省自然科学基金资助项目（ZR2017BEE003）；中国博士后科学基金项目（2017M612267）。

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