Numerical prediction of thermal performances in a concentric triple tube heat exchanger

Show simple item record Giovannoni, VG en Sharma, Rajnish en Raine, Robert en 2017-08-15T23:06:20Z en 2017-10 en
dc.identifier.citation International Journal of Thermal Sciences 120:86-105 Oct 2017 en
dc.identifier.issn 1290-0729 en
dc.identifier.uri en
dc.description.abstract In the last two decades, many research efforts have been carried out in order to scale down electronic and mechanical devices and components. Under this category also fall power generation devices such as Ultra-Micro Gas Turbines (UMGTs) which are one of the most suitable candidates as portable power supply. In many previous researches the feasibility and reliability of this type of systems have been proven, however many issues still need to be solved. Amongst these there are: excessive heat losses from the hot parts of the devices leading to low thermal efficiency, fluid dynamic losses at microscale need further investigation and the necessity of developing a material able to withstand combined thermal and mechanical stresses. A method to increase thermal efficiency and limiting fuel consumption is to recover heat from the combustion products to preheat the cold incoming mixture. Therefore, this study focuses on the interactions between combustion and heat exchanges at small scale. A numerical model of a three concentric tubes combustion chamber was developed and investigated with the aim of evaluating its thermal performances. A 17 species, 73 reactions skeletal mechanism able to describe methane oxidation was utilized for the purpose. A parametric study was carried out varying the mass flow rate and the thermal conductivity of the walls. Also, the effects of utilizing a flame holder in the combustion chamber were investigated. Results showed how the triple tube combustion chamber allows a good level of regeneration and the inclusion of the flame holder produces additional benefit in terms of heat transferred to the cold mixture. en
dc.publisher Elsevier BV en
dc.relation.ispartofseries International Journal of Thermal Sciences en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri en
dc.title Numerical prediction of thermal performances in a concentric triple tube heat exchanger en
dc.type Journal Article en
dc.identifier.doi 10.1016/j.ijthermalsci.2017.06.003 en
pubs.begin-page 86 en
pubs.volume 120 en
dc.rights.holder Copyright: Elsevier BV en
pubs.end-page 105 en
dc.rights.accessrights en
pubs.subtype Article en
pubs.elements-id 631092 en Engineering en Mechanical Engineering en
pubs.record-created-at-source-date 2017-06-17 en

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