Effective air flow distribution through perforated tiles is required to efficiently cool servers in a raised floor data center. We present detailed computational fluid dynamics (CFD) modeling of air flow through a perforated tile and its entrance to the adjacent server rack. The realistic geometrical details of the perforated tile, as well as of the rack are included in the model. Generally, models for air flow through perforated tiles specify a step pressure loss across the tile surface, or porous jump model based on the tile porosity. An improvement to this includes a momentum source specification above the tile to simulate the acceleration of the air flow through the pores, or body force model. In both of these models, geometrical details of tile such as pore locations and shapes are not included. More details increase the grid size as well as the computational time. However, the grid refinement can be controlled to achieve balance between the accuracy and computational time. We compared the results from CFD using geometrical resolution with the porous jump and body force model solution as well as with the measured flow field using particle image velocimetry (PIV) experiments. We observe that including tile geometrical details gives better results as compared to elimination of tile geometrical details and specifying physical models across and above the tile surface. A modification to the body force model is also suggested and improved results were achieved.

References

References
1.
Patankar
,
S. V.
,
2010
, “
Airflow and Cooling in a Data Center
,”
ASME J. Heat Transfer
,
132
, p.
073001
.10.1115/1.4000703
2.
Kang
,
S.
,
Schmidt
,
R.
,
Kelkar
,
K. M.
,
Radmehr
,
A.
, and
Patankar
,
S. V.
,
2001
, “
A Methodology for the Design of Perforated Tiles in Raised Floor Data Centers Using Computational Flow Analysis
,”
IEEE Trans. Compon. Packag. Technol.
,
24
, pp.
177
183
.10.1109/6144.926380
3.
Karki
,
K. C.
, and
Patankar
,
S. V.
,
2006
, “
Airflow Distribution Through Perforated Tiles in Raised-Floor Data Centers, Building and Environment
,”
Build. Environ.
,
41
, pp.
734
744
.10.1016/j.buildenv.2005.03.005
4.
Schmidt
,
R. R.
,
Karki
,
K. C.
,
Kelkar
,
K. M.
,
Radmehr
,
A.
, and
Patankar
,
S. V.
,
2001
, “
Measurements and Predictions of the Flow Distribution Through Perforated Tiles in Raised-Floor Data Centers
,”
Pacific Rim/ASME International Electronic Packaging Technical Conference and Exhibition
,
Kauai, HI, July 8–13, ASME Paper No. IPACK2001-15728
.
5.
Rambo
,
J.
, and
Joshi
,
Y.
,
2006
, “
Convective Transport Process in Data Centers
,”
Numer. Heat Transfer, Part A
,
49
, pp.
923
945
.10.1080/10407780500496562
6.
Rambo
,
J.
, and
Joshi
,
Y.
,
2007
, “
Modeling of Data Center Airflow and Heat Transfer: State of the Art and Future Trends
,”
Distrib. Parallel Databases
,
21
, pp.
193
225
.10.1007/s10619-006-7007-3
7.
Cruz
,
E.
,
Joshi
,
Y.
,
Iyengar
,
M.
, and
Schmidt
,
R.
,
2009
, “
Comparison of Numerical Modeling to Experimental Data in a Small Data Center Test Cell
,”
ASME International Electronic Packaging Technical Conference and Exhibition
,
San Francisco, CA, July 19–23
,
ASME
Paper No. InterPACK2009-89306.10.1115/InterPACK2009-89306
8.
Iyengar
,
M.
,
Schmidt
,
R. R.
,
Hamann
,
H.
, and
VanGilder
,
J.
,
2007
, “
Comparison Between Numerical and Experimental Temperature Distributions in a Small Data Center Test Cell
,”
ASME International Electronic Packaging Technical Conference and Exhibition
,
Vancouver, BC, Canada
, July 8–12,
ASME
Paper No. IPACK2007-33508.10.1115/IPACK2007-33508
9.
Abdelmaksoud
,
W. A.
,
Khalifa
,
H. E.
,
Dang
,
T. Q.
,
Elhadidi
,
B.
,
Schmidt
,
R. R.
, and
Iyengar
,
M.
,
2010
, “
Experimental and Computational Study of Perforated Floor Tile in Data Centers,” 12th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems
(
ITherm
),
Las Vegas, NV, June 2–5
.10.1109/ITHERM.2010.5501413
10.
Abdelmaksoud
,
W. A.
,
Khalifa
,
H. E.
,
Dang
,
T. Q.
,
Schmidt
,
R. R.
, and
Iyengar
,
M.
,
2010
, “
Improved CFD Modeling of a Small Data Center Test Cell
,”
12th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems
(
ITherm
),
Las Vegas, NV, June 2–5
.10.1109/ITHERM.2010.5501425
11.
Freid
,
E.
, and
Idelchik
,
I. E.
,
1989
,
Flow Resistance, A Design Guide for Engineers
,
Hemisphere
,
New York
.
12.
Kumar
,
P.
, and
Joshi
,
Y.
,
2010
, “
Experimental Investigations on the Effect of Perforated Tile Air Jet Velocity on Server Air Distribution in a High Density Data Center
,”
12th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems
(
ITherm
),
Las Vegas, NV, June 2–5
.10.1109/ITHERM.2010.5501337
13.
Kumar
,
P.
,
Sundaralingam
,
V.
, and
Joshi
,
Y.
,
2010
, “
Dynamics of Cold Aisle Air Distribution in a Raised Floor Data Center
,”
3rd International Conference on Thermal Issues in Emerging Technologies Theory and Applications
(
ThETA
),
Cairo, Egypt, December 19–22
.10.1109/THETA.2010.5766384
14.
Nelson
,
G.
,
2007
, “
Development of an Experimentally-Validated Compact Model of a Server Rack
,” M.S. thesis,
Georgia Institute of Technology
,
Atlanta, GA
.
15.
Arghode
,
V. K.
, and
Joshi
,
Y.
,
2013
, “
Modeling Strategies for Air Flow Through Perforated Tile in a Data Center
,”
IEEE Trans. Compon., Packag. Manuf. Technol.
,
3
, pp.
800
810
.10.1109/TCPMT.2013.2251058
16.
Patankar
,
S. V.
,
1980
,
Numerical Heat Transfer and Fluid Flow
,
Hemisphere
,
New York
.
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