Validations of CFD Code for Density-Gradient Driven Air Ingress Stratified Flow Page: 3 of 10
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temperature difference relative to the ambient was
always less than 20C.
Acodn to Grblbue et c al"19) the
exeimna satr is manl ctibtdbyte
Gas Lnlt/oufrI
pnthwate was ver srtcmaeto aaceisi
i f 1.5 m)
Trp>citiurc flaEi remnord 7 hoi-wvic Oxygen ia
e fearontI w Iameaurd mesus1tng e -
(1-T 100)
Figure 1. Experimental arrangement (Grobelbauser
et al. 1993).
According to Grobelbauser et al. (1993), the
experimental scatter is mainly contributed by the
manually opened gate. However, the time required to
open the gate was very short compared to characteristic
flow times. The gate velocity was reported to be 3-4 m/is,
while flow velocity was reported to be 0.2-1.8 i/s. The
velocity of the front was measured by using seven hot-
wire probes placed along the floor (for heavy gas) as
shown in Figure 2, or along the ceiling (for lighter gas)
as shown in Figure 3. These probes were used as trip
wires to give the signal of the arrival time of the current
front. Figures 2 and 3 show the propagation velocities of
the fronts of heavy gas and light gas, respectively. The
experiment was conducted with combinations of five
different gases: air, argon, carbon dioxide, Freon 22, and
helium, producing density ratios ranging from 0.046 to
0.9. Seven different gas combinations were taken into
consideration (See Table 1). Each gas combination was
tested in two configurations: first with the heavy gas in
the smaller chamber and the light gas in the larger
chamber, then vice versa.6-
14-
12nh
T (5) g*
64.
CAD, and Argon
Argon and Air ..n
R22 and Argon -- -
RE22 and Air -----
Air andl Helium -
Argon and Heihumn """
K222 anrd Helium - -0)
05 1.0 15 2.0 2.5 30
x (i)Figure 2. Propagation velocities of dense gas and
light gases (Grobelbauser et al. 1993)-dense gas.16 -
14 -
12-
10-6-
4-W 1.
(b)
Q00 0.5 1.0 15 2.0 2.5 3.0
x (Mn)
Figure 3. Propagation velocities of dense gas and
light gases (Grobelbauser et al. 1993)-light gas.2
e
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Oh, Chang H.; Kim, Eung S.; Schultz, Richard & Petti, David. Validations of CFD Code for Density-Gradient Driven Air Ingress Stratified Flow, article, May 1, 2010; Idaho. (https://digital.library.unt.edu/ark:/67531/metadc1014774/m1/3/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.