2-D NUMERICAL STUDY OF HEAT TRANSFER CROSSFLOW ON SINGLE CIRCULAR CYLINDER AND TANDEM WITH TURBULENT VISCOSITY MODIFICATION

Arif Kurniawan

Abstract


The  crossflow in cylinder marked by the phenomenon of stagnation point, shear layer separation and wake formation. Characteristics of flow regimes can be unsteady laminar flow (the formation of vortex shedding regime), transitional (regime with the transition to turbulent flow pattern in the wake area) and sub-critical (regime formation of the turbulent on shear layer). The value of the Reynolds number is very influential on the flow regimes characteristics of the flow, while the heat transfer process is heavily influenced by the value of Prandtl number. The amount of heat transfer is indicated by the parameter of  Nusselt number. This study uses a numerical study by modifying the quantity of turbulent, ie the turbulent viscosity by interpreting UDF (user defined function). The results of numerical studies in the form of Nusselt number will be compared with the value of Nusselt number of experimental results and to create a basis consept for studying the mechanism of the flow phenomenon and  heat transfer in the heat exchanger tube banks. The method used is a steady and unsteady 2-DRANS (Reynolds-averaged Navier Stokes) numerical simulations with 3 modeling, namely the standard k-є, standard k-ω and SST k-ω turbulence models. 


Keywords


RANS, UDF, Nusselt number, turbulent viscosity

References


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Lowery, G.W. and Vachon, R.I. (1974). The Effect of Turbulence on Heat Transfer from Heated Cylinder, International Journal of Heat and Mass Transfer, Vol. 18:p. 1229-1242

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Roshko A. (1953), On the Development of Turbulent Wakes From Vortex Streets, (1953) Supersedes NACA TN 2913.

Sarkar, S., et.al. (2011), Unsteady wake dynamics and heat transfer in forced and mixed convection past a circular cylinder in cross flow for high Prandtl numbers, International Journal of Heat and Mass Transfer 54 (2011)3536-3551.

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DOI: https://doi.org/10.29313/ethos.v0i0.2238

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Alamat Redaksi:

LPPM Unisba, Lantai 2, Jl. Purnawarman 63, Bandung 40116, Jawa Barat, (022) 4203368 , (022) 4264064. ethos.unisba@gmail.com / ethos@unisba.ac.id

 

 

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