INT. J. NUM. METH HEAT FLUID FLOW, VOL.zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFE 3, 15-33 (1993)
NUMERICAL INVESTIGATION OF TURBULENT FLUID
FLOW AND HEAT TRANSFER CHARACTERISTICS
IN A STREAMWISE-PERIODIC CORRUGATED DUCT
WITH CONSTANT CROSS-SECTIONAL AREA
BIJAN FARHANIEH AND BENGT SUNDEN
Department of Thermo- and Fluid Dynamics, Chalmers University of Technology, S-412 96 Göteborg, Sweden
ABSTRACT
Turbulent fully developed periodic heat transfer andfluidflowcharacteristics in corrugated two-dimensional
ducts with constant cross-sectional area are numerically investigated. The governing equations are solved
numerically by a finite-volume method for elliptic flows in complex geometries using collocated variables
and Cartesian velocity components. Two different turbulence models (the second moment closure and the zyxwvutsrqponm
k-εzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ) for approximation of the Reynolds stresses are applied. The performance of the models were assessed
by comparing the results with experimental data. The results show the advantages of the stress closure
model compared to the k-ε model. The overall Nusselt number and the pressure drop ratio results are
obtained for the boundary condition of a uniform wall temperature for two inclination angles Φ and two
duct aspect ratios (H/L) and for Reynolds number ranging from around 3000 to 35,000. The overall Nusselt
number predicted by the k-ε model is upto 25% higher than the values predicted by the second moment
closure. The plots of the velocity vectors show a complex flow pattern. The mechanisms of heat transfer
are explained by theflowphenomena separation, deflection, recirculation, and reattachment.
KEY WORDS Corrugated ducts Turbulent fluid flow Finite volume method
NOMENCLATURE
A
CP
D
h
f
ft
G
H
H
+
h
h
av
k
K
c
L
n
per-cycle heat transfer surface area
specific heat
hydraulic diameter (= 2H )
wall-distance function
friction factor
scale factor of the velocity vectors
height of the duct
U
*
H/v
heat transfer coefficient
average heat transfer coefficient
turbulent kinetic energy
thermal conductivity of the fluid
streamwise length of a module
mass flow rate
normal vector
0961-5539/93/010015-19S2.00
© 1993 Pineridge Press Ltd
Received May 1992
Revised November 1992