Effect of flow geometry parameters on transient heat transfer for turbulent flow in a circular tube with baffle inserts |
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| Affiliation: | 1. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, 91775-1111, Iran;1. Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, 108 Shoubra St., 11629 Cairo, Egypt;2. Farwaniya Hospital, Ministry of Health, 86400 Farwaniya, Kuwait;1. Laboratory of Mechanical Engineering (LGM), University Mohamed Khider of Biskra, B.P. 145, RP 07000, Biskra, Algeria;2. Laboratory of Civil Engineering, Hydraulics, Sustainable Development and Environment (LAR-GHYDE), University Mohamed Khider of Biskra, B.P. 145, R.P. 07000, Biskra, Algeria;3. Department of Thermal Machines and Engines, University of Cadiz, 11519, Puerto Real, Spain;4. Department of Mechanical Engineering and Industrial Design, University of Cadiz, 11519, Puerto Real, Spain;1. School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran;2. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, 91775-1111, Iran |
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| Abstract: | The effect of the flow geometry parameters on transient forced convection heat transfer for turbulent flow in a circular tube with baffle inserts has been investigated. The characteristic parameters of the tubes are pitch to tube inlet diameter ratio H/D = 1, 2 and 3, baffle orientation angle β = 45°, 90° and 180°. Air, Prandtl number of which is 0.71, was used as working fluid, while stainless steel was considered as pipe and baffle material. During the experiments, different geometrical parameters such as the baffle spacing H and the baffle orientation angle β were varied. Totally, nine types of baffle inserted tube were used. The general empirical equations of time averaged Nusselt number and time averaged pressure drop were derived as a function of Reynolds number corresponding to the baffle geometry parameters of pitch to diameter ratio H/D, baffle orientation angle β, ratio of smooth to baffled cross-section area So/Sa and ratio of tube length to baffle spacing L/H were derived for transient flow conditions. The proposed empirical correlations were considered to be applicable within the range of Reynolds number 3000 ? Re ? 20,000 for the case of constant heat flux. |
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