Heat transfer and pressure drop in the horizontal double pipes with and without twisted tape insert |
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| Affiliation: | 1. School of Engineering and Technology, Central Queensland University (CQUniversity), Rockhampton, Queensland 4702, Australia;2. Department of Mechanical Engineering, Chittagong University of Engineering and Technology (CUET), Chittagong 4349, Bangladesh;3. School of Engineering and Information Technology, The University of New South Wales, Canberra, ACT 2600, Australia;4. School of Mechanical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia;5. Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;2. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand |
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| Abstract: | The heat transfer characteristics and the pressure drop in the horizontal double pipes with twisted tape insert are investigated. Two test sections with different relative pitches are tested. The inner and outer diameters of the inner tube are 8.10 and 9.54 mm, respectively. The twisted tape is made from the aluminium strip with thickness of 1 mm and the length of 2000 mm. Cold and hot water are used as working fluids in shell side and tube side, respectively. The test runs are done at the cold and hot water mass flow rates ranging between 0.01 and 0.07 kg/s, and between 0.04 and 0.08 kg/s, respectively. The inlet cold and hot water temperatures are between 15 and 20 °C, and between 40 and 45 °C, respectively. The results obtained from the tube with twisted insert are compared with those without twisted tape. Non-isothermal correlations based on the data gathered during this work for predicting the heat transfer coefficient and friction factor of the horizontal pipe with twisted taped insert are proposed. The majority of the data falls within ± 15%, ± 10% of the proposed correlations for heat transfer coefficient and friction factor, respectively. |
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