The heat transfer characteristics of three submerged radial jet reattachment (RJR) nozzles with exit angles of +45, 0, and −10 deg are compared to the heat transfer characteristics of a conventional submerged in-line jet (ILJ) nozzle. The nozzles are compared at their favorable spacing from the impingement surface. The comparisons are based on two criteria: (1) identical fluid flow power, and (2) identical peak pressure exerted on the impingement surface. The local and area-averaged Nusselt numbers are presented. Experiments were conducted for two different flow power conditions. Comparison under identical flow power indicates that significant enhancements in local and comparable enhancements in area-averaged Nusselt numbers can be achieved with the RJR nozzles over the conventional ILJ nozzle while being able to control the net force exerted on the impingement surface. The comparison between the ILJ and RJR nozzles on the basis of the same peak pressure exerted on the impingement surface indicates that the zero degree exit angle RJR nozzle heat transfer characteristics are superior to the ILJ nozzle.

Issue Section:
Forced Convection
Keywords:
Augmentation and Enhancement, Jets, Materials Processing and Manufacturing Process
Topics:
Heat transfer, Nozzles, Flow (Dynamics), Pressure, Jets, Fluid dynamics, Manufacturing, Materials processing
1.
Downs, S. J., and James, E. H., 1987, “Jet Impingement Heat Transfer—A Literature Survey,” ASME Paper No. 87-H-35.
2.
Goldstein
R. J.
,
Behbahani
A. I.
, and
Heppelmann
K. K.
,
1986
, “
Stream-wise Distribution of the Recovery Factor and the Local Heat Transfer Coefficient to an Impinging Circular Air Jet
,”
International Journal Heat Mass Transfer
, Vol.
29
, pp.
1227
–
1235
.
3.
Habetz, D. K., Page, R. H., and Seyed-Yagoobi, J., 1992, “A Drying Comparison of Radial Jet Reattachment and Standard In-Line Jet Impingement,” Drying ’92, Majumdar, A. S., ed., pp. 953–962.
4.
Kline
S. J.
, and
McClintock
F. A.
,
1953
, “
Describing Uncertainties in Single Sample Experiments
,”
Mechanical Engineering
, Vol.
75
, Jan., pp.
3
–
8
.
5.
Lytle, D., and Webb, B. W., 1991, “Secondary Heat Transfer Maxima for Air Jet Impingement at Low Nozzle-to-Plate Spacings,” Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics, J. F. Keffer, R. K. Shah, and E. N. Ganic, eds., Elsevier, New York, pp. 776–783.
6.
Martin
H.
,
1977
, “
Heat and Mass Transfer Between Impinging Gas Jets and Solid Surfaces
,”
Advances in Heat Transfer
, Vol.
13
, pp.
1
–
60
.
7.
Obot, N. T., Mujumdar, A. S., and Douglas, W. J. M., 1980, “Design Correlations for Heat and Mass Transfer Under Various Turbulent Impinging Jet Configurations,” Drying ’80, Vol. 1, pp. 338–402.
8.
Ostowari
C.
, and
Page
R. H.
,
1992
, “
Convective Heat Transfer From a Radial Jet Reattachment
,”
AIChE Symposium Series
, Vol.
88
, No.
288
, pp.
189
–
197
.
9.
Page
R. H.
, and
Ostowari
C.
,
1985
, “
Radial Jet Reattachment Flow
,”
Bulletin American Physical Society
, Vol.
30
, p.
1698
1698
.
10.
Page, R. H., Ostowari, C., and Carbone, J. S., 1986, “Radial Jet Flow,” Proc. 4th International Symposium on Flow Visualization, Paris, France, pp. 512–521.
11.
Page
R. H.
,
Carbone
J.
, and
Ostowari
C.
,
1990
, “
Radial Jet Reattachment Force
,”
Experiments in Fluids
, Vol.
8
, No.
5
, pp.
297
–
298
.
12.
Page
R. H.
, and
Seyed-Yagoobi
J.
,
1990
, “
A New Concept for Air or Vapor Impingement Drying
,”
TAPPI Journal
, Vol.
73
, pp.
229
–
234
.
13.
Page, R. H., Ostowari, C., Seyed-Yagoobi, J., and Gruber, T. C., Jr., 1993, “Measurement of Impinging Jet Heat Transfer Utilizing Infrared Techniques,” Experimental Heat Transfer, Fluid Mechanics, and Thermodynamics, Elsevier Science Publishers, New York, Vol. I, pp. 726–731.
14.
Polat
S.
,
Huang
B.
,
Mujumdar
A. S.
, and
Douglas
W. J. M.
,
1989
, “
Numerical Flow and Heat Transfer Under Impinging Jets: A Review
,”
Ann. Rev. Num. Fluid Mech. Heat Transfer
, Vol.
2
, pp.
157
–
197
.
15.
Popiel
C. O.
, and
Trass
O.
,
1991
, “
Visualization of Free and Impinging Round Jets
,”
Exp. Thermal Fluid Sci.
, Vol.
4
, pp.
253
–
261
.
16.
Thiele, E. W., Seyed-Yagoobi, J., Page, R. H., and Castillo-Garcia, H., 1995, “Enhancement Drying Rate, Moisture Profiling, and Sheet Stability on an Existing Paper Machine With RJR Blow Boxes,” Proc. TAPPI Papermakers Conference, Chicago, IL, pp. 223–228.
17.
Viskanta
R.
,
1993
, “
Heat Transfer to Impinging Isothermal Gas and Flame Jets
,”
Experimental Thermal and Fluid Science
, Vol.
6
, pp.
111
–
134
.
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