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Refrigerant boiling at low heat flux in vertical tubes with heat transfer enhancing fittings |
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| Affiliation: | 1. Center of Excellence for Scientific Research Collaboration with MIT, KFUPM Box # 1276, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;2. Mechanical Engineering Department, KFUPM Box # 1474, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;1. CAC Laboratory, LG Electronics, Changwon 641-713, South Korea;2. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea;3. School of Mechanical Engineering, Pusan National University, Pusan 609-735, South Korea;1. Energy Research Institute@NTU, Interdisciplinary Graduate School, Nanyang Technological University, Singapore, 637141;2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371;3. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, 639798 |
| Abstract: | The paper presents the results of thermal and flow analyses of the boiling process in vertical tubes with heat transfer enhancing inserts. Tests were performed for three different geometrical shapes of the inserts: a spiral tape with a core rod, a rib insert and a spring insert. Experimental measurements were performed for R507, R410A and R407C refrigerants at low heat flux. The obtained results indicate the increase ratio of heat transfer and flow resistance coefficients in tubes with inserts, as opposed to a plain one. Finally, the paper presents the dimensionless relationships which enable the calculation of heat transfer coefficients and pressure drops during boiling in vertical tubes with the studied heat transfer enhancing inserts. |
| Keywords: | Boiling in vertical tubes Heat transfer enhancing inserts Flow resistances Heat transfer coefficients Ebullition dans des tubes verticaux Inserts améliorant le transfert de chaleur Résistances à l'écoulement Coefficients de transfert de chaleur |
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