扭曲管同轴套管换热器强化传热和流阻特性

doi:10.11949/0438-1157.20240459

摘要/Abstract

摘要：

开发一种新型扭曲管同轴套管换热器，对其传热和流动特性进行实验测试，并拟合管程及壳程的Nusselt数（ $N u$ ）和摩擦因子（ $f$ ）关联式。实验结果表明：随着流速的增大，总传热系数和流阻升高。在测试范围内（0.1~1.5 m/s），总传热系数增幅约为34%，管程流阻从37 Pa升高约120倍至6033 Pa，壳程流阻从361 Pa升高至130761 Pa。当1000< $R e$ $\leq$ 10000时，扭曲管同轴套管换热器综合评价因子（ $η$ ）>1，最高为2.3；当10000< $R e$ <30000时，η<1。在管程流速为0.1~0.5 m/s、壳程流速为0.1~0.4 m/s的范围内，扭曲管同轴套管换热器的整体综合性能最佳，说明扭曲管同轴套管换热器适用于小型制冷空调设备，适合Reynolds数较低的应用场景。

关键词: 传热, 层流, 湍流, 流动阻力, 同轴套管换热器

Abstract:

A novel twisted tube coaxial heat exchanger was developed, and its heat transfer and flow characteristics were experimentally tested. Correlation formulas for Nusselt number (Nu) and friction factor (f ) criteria for the tube and shell passes were derived. The experimental results indicate that the total heat transfer coefficient and flow resistance increase with higher flow velocities. Within the test range of 0.1—1.5 m/s, the total heat transfer coefficient increased by approximately 34%, while the flow resistance increased from 37 Pa to 6033 Pa, representing a nearly 120-fold increase. The shell flow resistance increased from 361 Pa to 130761 Pa. For Reynolds numbers between 1000 and 10000, the performance evaluation factor ( $η$ ) of the twisted tube coaxial heat exchanger exceeds 1, and reaches a maximum of 2.3. However, for Reynolds numbers between 10000 and 30000, $η$ is less than 1. The overall comprehensive performance of the twisted tube coaxial heat exchanger is the best within a tube flow rate range of 0.1—0.5 m/s and a shell flow rate range of 0.1—0.4 m/s, indicating that it is suitable for small refrigeration and air conditioning equipment as well as application scenarios with low Reynolds numbers.

Key words: heat transfer, laminar flow, turbulent flow, flow resistance, coaxial casing heat exchanger

中图分类号:

TK 172

尹应德, 农雅善, 李远羽, 刘世杰. 扭曲管同轴套管换热器强化传热和流阻特性[J]. 化工学报, 2024, 75(10): 3528-3535.

Yingde YIN, Yashan NONG, Yuanyu LI, Shijie LIU. Enhanced heat transfer and flow resistance characteristics of twisted tube double-pipe heat exchangers[J]. CIESC Journal, 2024, 75(10): 3528-3535.

图/表 13

图1 扭曲管结构参数

Fig.1 Structural parameter of twisted tube

表1 扭曲管几何参数

Table 1 Twisted tube geometric parameters

长轴A/mm	短轴B/mm	扭矩S/mm
22.86	14.82	200

图2 实验装置测试示意图

Fig.2 Experimental device test diagram

图3 实验装置实物图

Fig.3 Physical diagram of experimental device

图4 扭曲管同轴套管换热器实物图

Fig.4 Physical diagram of twisted tube coaxial tube heat exchanger

表2 实验装置主要部件

Table 2 Main components of experimental device

名称	规格/型号	数量
变频离心泵	25WBS 2-8-0.25	2
水箱	0.8 m×0.8 m×0.7 m	2
半导体制冷片	DC 12 V，30 A，制冷功率 288 W	3
电加热棒	304不锈钢，其中 220 V、2 KW一台， 380 V、5 KW一台，380 V、6 KW两台	4
测温球阀	DN32	4
闸阀	D_e32	4

表3 实验测量仪器及精度

Table 3 Experimental measuring instruments and accuracy

名称	型号	数量	量程	精度
温度传感器	PT100	4	0~100℃	±0.1℃
压差传感器	CYYZ3051-X-3-B3	2	0~20 kPa	±2%
超声波流量计	DN32	2	0~12 m³/h	±1%
超声波能量计	HU32	2	0.06~12 m³/h	2级

图5 传热系数和流阻随流速的变化

Fig.5 Variation of heat transfer coefficient and flow resistance with flow velocity

图6 管程Nu随Re的变化

Fig.6 Variation of tube path Nu with Re

图7 壳程Nu随Re的变化

Fig.7 Variation of shell path Nu with Re

图8 管程f随Re的变化

Fig.8 Variation of pipe path f with Re

图9 壳程f随Re的变化

Fig.9 Variation of shell path f with Re

图10 综合评价因子随管程Re的变化

Fig.10 η along with change of pipe path Re

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