NDLI: Development of an Advanced High Temperature Heat Exchanger Design for Hydrogen Production

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Subramanian, Sundaresan Akberove, Roald Chen, Yitung Anthony, E. Hechanova Losier, Clayton Ray De
Copyright Year	2004
Abstract	This paper deals with the development of an advanced high temperature heat exchanger design for hydrogen production by the sulfur iodine thermochemical cycle from advanced nuclear reactor concepts. The offset strip-fin hybrid plate type compact heat exchanger concept is chosen, and the material of manufacture is the liquid silicon impregnated carbon composite. The offset strip-fin is chosen as a method of heat transfer enhancement due to the boundary layer restart mechanism between the fins that has a direct effect on enhancing heat transfer. The effect of the fin thickness, pitch in flow direction, and the aspect ratio of the offset fins on the flow field and heat transfer are studied in 2-D using Computational Fluid Dynamics (CFD) techniques, and the results are then compared with the analytical calculation results. The preprocessor GAMBIT is used to create a computational mesh, and the CFD software package FLUENT, that is based on the finite volume method is used to produce numerical results. Proper dimensions of the strip fins need to be chosen in order to have an optimized heat transfer enhancement coupled with a reduced pressure drop. The study is conducted with helium gas as the working fluid with varied of Reynolds number values. The flow and heat transfer is considered to become periodically fully developed after a certain entrance length hence numerical simulations were performed using periodic boundary conditions. Two-dimensional numerical simulations were also performed for the whole length of the heat exchanger which has 37 such periodic modules. Comparison study was performed between the cases of fins with rectangular and curved geometry. Attempt has also been made in order to validate the coefficient of fin thickness (Cfin) value using CFD techniques, which has been used in the existing empirical correlations to suit this type of heat exchanger geometry. The model developed in this paper is used to investigate the heat exchanger design parameters in order to find an optimal design.
Sponsorship	Heat Transfer Division
Starting Page	29
Ending Page	36
Page Count	8
File Format	PDF
ISBN	079184711X
DOI	10.1115/IMECE2004-59623
Volume Number	Heat Transfer, Volume 2
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Strips Cycles Computer software Fins High temperature Finite volume methods Design Carbon composites Fluids Silicon Sulfur Computational fluid dynamics Computer simulation Reynolds number Dimensions Heat exchangers Helium Flow (dynamics) Geometry Pressure drop Boundary-value problems Nuclear reactors Hydrogen production Heat transfer Boundary layers
Content Type	Text
Resource Type	Article

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