The characteristics of the impinging heat transfer of a three-by-three square array of submerged, elliptic impinging jets was studied. Low Reynolds number conditions, 300 to 1500, are considered for two different elliptic jet aspect ratios, with the impingement distance ranging from 1 to 6 jet hydraulic diameters. A transient thermochromic liquid crystal method was used to map the local heat transfer coefficient distribution. The results are reported for the unit cell under the center jet and detail the mean heat transfer as well as the characteristics of the spatial variation of the heat transfer coefficient. The average heat transfer is found to depend inversely on the elliptic jet aspect ratio at these low Reynolds numbers. Distributions of the heat transfer coefficient, h, are also used to obtain proper orthogonal decompositions of h which are used to identify major spatially distributed features. [S0022-1481(00)02102-2]

Issue Section:
Jets, Wakes, and Impingements
Keywords:
Enhancement, Forced Convection, Heat Transfer, Impingement, Jets, heat transfer, jets, liquid crystals
Topics:
Heat transfer, Heat transfer coefficients, Jets, Reynolds number, Liquid crystals
1.
Martin
,
H.
,
1977
, “
Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces
,”
Adv. Turbulence
,
2
, pp.
37
–
44
.
2.
Goldstein
,
R. J.
, and
Timmers
,
J. F.
,
1982
, “
Visualization of the Heat transfer From Arrays of Impinging Jets
,”
Int. J. Heat Mass Transf.
,
25
, No.
12
, pp.
1857
–
1868
.
3.
Pan, Y., and Webb, B. W., 1994, “Visualization of Local Heat Transfer Under Arrays of Free-Surface Liquid Jets,” Proceedings of the 10th International Heat Transfer Conference, Vol. 4, Institution of Chemical Engineers, Rugby, UK, pp. 77–82.
4.
Huber
,
A. M.
, and
Viskanta
,
R.
,
1994
, “
Effect of Jet-Jet Spacing on Convective Heat Transfer to Confined, Impinging Arrays of Axisymmetric Jets
,”
Int. J. Heat Mass Transf.
,
37
, No.
18
, pp.
2859
–
2869
.
5.
Husain
,
H.
, and
Hussain
,
F.
,
1991
, “
Elliptic Jets. Part 2. Dynamics of Coherent Structures: Pairing
,”
J. Fluid Mech.
,
233
, pp.
439
–
482
.
6.
Ho
,
C. M.
, and
Gutmark
,
E.
,
1987
, “
Vortex Induction and Mass Entrainment in a Small Aspect-Ratio Elliptic Jet
,”
J. Fluid Mech.
,
179
, pp.
383
–
405
.
7.
Lee
,
S. J.
,
Lee
,
J. H.
, and
Lee
,
D. H.
,
1994
, “
Local Heat Transfer Measurements from an Elliptic Jet Impinging on a Flat Plate Using Liquid Crystal
,”
Int. J. Heat Mass Transf.
,
37
, No.
6
, pp.
967
–
976
.
8.
Barker, J. M., and Liburdy, J. A., 1999, “Characterization of the Large-Scale Structures in an Impinging Elliptic Jet,” First International Symposium on Turbulence and Shear Flow, S. Banerjee and J. K. Eaton, eds., Begell House, New York, pp. 653–658.
9.
Arjocu, S. C., and Liburdy, J. A., 1997, “Flow Structures in an Impinging Elliptic Jet Array,” Proceedings of ASME-Fluids Div, ASME, New York, Vancouver, BC, Canada.
10.
Arjocu
,
S. C.
, and
Liburdy
,
J. A.
,
1999
, “
Near Surface Characterization of an Impinging Elliptic Jet Array
,”
J. Fluids Eng.
121
, No.
2
, pp.
384
–
390
.
11.
Sirovich
,
L.
, and
Kirby
,
M.
,
1990
, “
An Eigenfunction Approach to Large Scale Transitional Structures in the Jet Flow
,”
Phys. Fluids A
,
2
, No.
2
, pp.
127
–
135
.
12.
Glauser
,
M. N.
,
Leib
,
S. J.
, and
George
,
W. K.
,
1987
, “
Coherent Structures in the Axisymmetric Turbulent Jet Mixing Layer
,”
Turbulent Shear Flow
,
5
, pp.
134
–
145
.
13.
Hussain
,
F.
, and
Hussain
,
H.
,
1989
, “
Elliptic Jets. Part 1. Characteristics of Unexcited and Excited Jets
,”
J. Fluid Mech.
,
208
, pp.
257
–
320
.
14.
Von Wolfersdorf
,
J.
,
Hoecker
,
R.
, and
Sattelmayer
,
T.
,
1993
, “
A Hybrid Transient Step-Heating Heat Transfer Measurement Technique Using Heater Foils and Liquid-Crystal Thermography
,”
ASME J. Heat Transfer
,
115
, pp.
319
–
324
.
15.
Arjocu, S. C., 1997, “Elliptic Jet Flow Structures and Heat Transfer in as Jet Array,” Ph.D. dissertation, Clemson University, Clemson, SC.
16.
Lumley, L. J., 1970, Stochastic Tools in Turbulence, Academic Press, New York.
17.
Arjocu, S. C., and Liburdy, J. A., 1997, “Analysis of Flow Structures Occurring in Impingement of Elliptic Jet Arrays,” 28th AIAA Fluid Dynamics Conference, AIAA, Reston, VA.
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