Vol.1, No 8, 2001 pp. 1091 - 1105
UDC 621.039.534:517.538
DESIGN OF SHELL-AND-TUBE HEAT
EXCHANGERS BY USING CFD TECHNIQUE – PART ONE:
THERMO-HYDRAULIC CALCULATION
Žarko Stevanović1, Gradimir Ilić2,
Nenad Radojković2,
Mića Vukić2, Velimir Stefanović2,
Goran Vučković2
1Department of Thermalmechanics, Mechanical
Faculty University of Belgrade
2Faculty of Mechanical Engineering,
University of Niš, FR Yugoslavia
Abstract. In this paper, an iterative procedure for sizing shell-and-tube
heat exchangers according to prescribed pressure drop is shown, then the
thermo-hydraulic calculation and the geometric optimization for shell and
tube heat exchangers on the basis of CFD technique have been carried out.
Modeling of shell and tube heat exchangers for design and performance evaluation
is now an established technique used in industry. In this paper, a numerical
study of three-dimensional fluid flow and heat transfer in a shell and
tube model heat exchanger is described. The baffle and tube bundle was
modeled by the 'porous media' concept. Three turbulent models were used
for the flow processe. The velocity and temperature distributions as well
as the total heat transfer rate were calculated. The calculations were
carried out using PHOENICS Version 3.3 code.
Key words: shell-and-tube heat exchanger, turbulence modeling,
computational fluid dynamics, parametric design optimization
PROJEKTOVANJE DOBOŠASTIH IZMENJIVAČA TOPLOTE
PRIMENOM CFD TEHNIKE
- PRVI DEO: TERMO-HIDRAULIČKI PRORAČUN
U ovom radu je prikazana jedna iterativna procedura za određivanje geometrije
dobošastih izmenjivača toplote bazirana na pripisanom padu pritiska procesnih
fluida, a zatim je primenom CFD tehnike izvršen termo-hidraulički proračun
i optimizacija usvojene geometrije razmenjivača toplote. Dizajniranje razmenjivača
toplote primenom CFD tehnike sve više se primenjuje u industriji. U ovom
radu je razmatrano trodimenzionalno strujanje fluida i razmena toplote
u dobošastom razmenjivaču toplote. Primenjen je koncept porozne sredine.
Korišćena su tri turbulentna modela. Određena su brzinska i temperaturska
polja procesnih fluida u omotaču i cevima razmenjivača toplote. Proračun
je izvršen primenom PHOENICS-a 3.3.
Ključne reči: dobošasti razmenjivač toplote, turbulentni model,
CFD
