Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/103020
Title: COMPARATIVE STUDY ON STEADY AND UNSTEADY HEAT TRANSFER ANALYSIS OF A SPHERICAL ELEMENT USING AIR/WATER MIST TWO-PHASE FLOW
Authors: Abed, A.
Shcheklein, S.
Pakhaluev, V.
Issue Date: 2021
Publisher: Serbian Society of Heat Transfer Engineers
Citation: Abed A. COMPARATIVE STUDY ON STEADY AND UNSTEADY HEAT TRANSFER ANALYSIS OF A SPHERICAL ELEMENT USING AIR/WATER MIST TWO-PHASE FLOW / A. Abed, S. Shcheklein, V. Pakhaluev. — DOI 10.2298/TSCI190527055A // Thermal Science. — 2021. — Vol. 25. — Iss. 1 Part B. — P. 625-635.
Abstract: In this study, two approaches to investigating the process cooling of a heated sphere were performed using air as well as air/water mist two-phase flow. Steady-state and unsteady heat transfer analysis were compared in the terms of the average surface temperature and heat transfer rate between the sphere surfaces and the cooling fluid. When the Bi < 0.1, the temperature variation inside sphere can be neglected and the wildly known lumped capacitance model can be applied to estimate the heat transfer coefficient by measuring the sphere surface temperature. The effect of the different factors such as the inlet Reynolds numbers, surface temperature and water mist rate on heat transfer characteristics are examined. The experimental results showed that the presence of water mist leads to a significant increase in heat transfer rate over the use of air coolant alone. Also, the unsteady thermal behaviors of the water mist impingement on the heated surface and dynamic-state of cooling process changing over the sphere surface were analyzed experimentally based on the unsteady surface temperature measurements. The experimental results of the unsteady heat transfer were compared to the results obtained from steady-state estimation under the corresponding surface temperature of the sphere. Moreover, the new proposed empirical correlation for the Nusselt number based on the present experimental data are given for practical uses. Results reasonably agree well within ±3.8%. © 2021. Society of Thermal Engineers of Serbia.
Keywords: BIOT NUMBER
LUMPED CAPACITANCE MODEL
SPHERE
UNSTEADY-STATE HEAT TRANSFER
URI: http://hdl.handle.net/10995/103020
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85102820941
PURE ID: 21019686
ee04aaad-2be5-4dca-8599-70aee1fab372
ISSN: 3549836
DOI: 10.2298/TSCI190527055A
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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