Online proceedings - EDA Publishing Association

7-9 October 2009, Leuven, Belgium
NOMENCLATURE
D h channel hydraulic diameter (m)
f
flow pulsation frequency (Hz)
h
heat transfer coefficient, q/ΔT lm (W/(m 2 K))
H channel depth (m)
k
thermal conductivity of water (W/(mK))
L channel length (m)
Nu Nusselt number, h D h /k
δNu relative heat transfer enhancement, (Nu p -Nu s )/Nu s
Pr Prandtl number, ν/α
q surface heat flux (W/m 2 )
Re Reynolds number, U D h /ν
Re p pulsating Reynolds number, U p D h /ν
T i water inlet mean temperature (°C)
T o water outlet mean temperature (°C)
T w channel wall temperature (°C)
logarithmic mean temperature difference,
ΔT lm
( Tw −To) −( Tw −Ti)
(°C)
log (( T −T ) ( T −T)
)
w o w i
U mean channel steady velocity component (m/s)
U p mean channel pulsating velocity amplitude (m/s)
W channel width (m)
Wo Womersley number, ½D h (2πf/ν) 1/2
Greek symbols
α thermal diffusivity (m 2 /s)
ν
kinematic viscosity (m 2 /s)
Subscripts
p
q
s
T
pulsating flow component
constant wall heat flux
steady flow component
constant wall temperature
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©EDA Publishing/THERMINIC 2009 167
ISBN: 978-2-35500-010-2