Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22

›› 2011, Vol. 19 ›› Issue (6): 1069-1074.

• RESEARCH NOTES • Previous Articles

Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22

HAN Chonggang¹, YANG Weimin¹, DING Yumei¹, GUAN Changfeng¹, LI Fengxiang², ZHANG Zhen¹, YAN Hua¹

1. State Key Laboratory of Organio-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2. Practical New-type Patent Examination Department of State Intellectual Property Office of China, Beijing 100191, China

Received:2011-01-10 Revised:2011-08-26 Online:2012-04-24 Published:2011-12-28
Supported by:
Supported by the National Natural Science Foundation of Beijing (3102023);the National Science and Technology Support Plan Project (2011BAA04B02)

Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22

韩崇刚¹, 杨卫民¹, 丁玉梅¹, 关昌峰¹, 李锋祥², 张震¹, 阎华¹

1. State Key Laboratory of Organio-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
2. Practical New-type Patent Examination Department of State Intellectual Property Office of China, Beijing 100191, China

通讯作者: YANG Weimin, E-mail: yangwm@mail.buct.edu.cn
基金资助:
Supported by the National Natural Science Foundation of Beijing (3102023);the National Science and Technology Support Plan Project (2011BAA04B02)

Abstract

Abstract: The paper described experimental investigation of heat transfer and single-phase pressure drop through tubes with different rotor-assembled strands inserted in the Reynolds number range of 800-9000 with lubricant as working fluid. In the experiment, fixed mounts were employed to eliminate the entrance effect. The experimental results showed that the employment of fixed mounts led to a visible bias of friction factor in the laminar regime while it could not affect the Nusselt numbers significantly. Experiment for the tube inserted with rotors-assembled strand showed remarkable improvement for heat transfer with the Nusselt number increased by 200%-225% in the laminar regime and 125%-160% in the transitional regime. Meanwhile, the friction factor increased inevitably by 200%-300% within the same range of Reynolds number. The comparison of different rotor-assembled strands inserted tubes and plain tube showed that the heat transfer benefited from the increase of the diameter of rotor-assembled strand with the same lead and the decrease of the lead of rotor-assembled strand, so does the friction factor. Based on experimental data and thorough multivariant linear normal regression method, the correlations of average Nusselt number and friction factor are established.

Key words: heat transfer enhancement, rotor-assembled strand, friction factor, thermal performance factor

摘要： The paper described experimental investigation of heat transfer and single-phase pressure drop through tubes with different rotor-assembled strands inserted in the Reynolds number range of 800-9000 with lubricant as working fluid. In the experiment, fixed mounts were employed to eliminate the entrance effect. The experimental results showed that the employment of fixed mounts led to a visible bias of friction factor in the laminar regime while it could not affect the Nusselt numbers significantly. Experiment for the tube inserted with rotors-assembled strand showed remarkable improvement for heat transfer with the Nusselt number increased by 200%-225% in the laminar regime and 125%-160% in the transitional regime. Meanwhile, the friction factor increased inevitably by 200%-300% within the same range of Reynolds number. The comparison of different rotor-assembled strands inserted tubes and plain tube showed that the heat transfer benefited from the increase of the diameter of rotor-assembled strand with the same lead and the decrease of the lead of rotor-assembled strand, so does the friction factor. Based on experimental data and thorough multivariant linear normal regression method, the correlations of average Nusselt number and friction factor are established.

关键词: heat transfer enhancement, rotor-assembled strand, friction factor, thermal performance factor

HAN Chonggang, YANG Weimin, DING Yumei, GUAN Changfeng, LI Fengxiang, ZHANG Zhen, YAN Hua. Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22[J]. , 2011, 19(6): 1069-1074.

韩崇刚, 杨卫民, 丁玉梅, 关昌峰, 李锋祥, 张震, 阎华. Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22[J]. , 2011, 19(6): 1069-1074.

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Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22

Experimental Study of Heat Transfer Enhancement and Friction Loss Induced by Inserted Rotor-assembled Strand (II) Lubricant Oil 22

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