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Title: Transient heat transfer in pipes with time periodically changing boundary condition
Other Titles: Borularda zamanla periyodik olarak değişen sinir şarti ile geçici rejim isi transferi
Authors: Altun, A.H.
Ateş, A.
Atmaca, Şükrü Ulaş
Koçak, Sedat
Bilir, Şefik
Keywords: Fluid axial conduction
Laminar flow heat transfer in pipe
Time periodically changing boundary conduction
Transient heat transfer
Atmospheric temperature
Finite difference method
Laminar flow
Surface properties
Angular frequencies
Axial conduction
Downstream region
Heat transfer characteristics
Surface temperatures
Thermal entrance regions
Transient heat transfer
Heat transfer
Issue Date: 2018
Publisher: Turk Isı Bilimi ve Teknigi Dernegi
Abstract: Transient heat transfer in thermal entrance region of pipes with time periodically changing surface temperature is investigated. The problem is handled in a two-regional pipe for laminar, hydrodynamically developed flow by involving fluid axial conduction. The solution is made numerically by a finite-difference method. A parametric study is done to analyse the effects of Peclet number and angular frequency on heat transfer characteristics. The results show that, considerable amount of heat is diffused back towards the upstream region by axial fluid conduction, which causes preheating the fluid prior to the heated downstream region. The heat transfer characteristics, in all axial positions, including the preheated upstream and the fully developed region, are seen to change periodically in time, similar to the periodic change of the surface temperature in the downstream region. ©2018 TIBTD Printed in Turkey.
ISSN: 13003615
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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