A Liquid Crystal Scanning Thermography (LCST) technique is developed and implemented to visualize and measure three-dimensional temperature fields. Results are reported for natural convection in a differentially heated vertical cavity. Experiments are conducted under steady state conditions at Rayleigh numbers of about with glycerin as the working fluid. The scanning arrangement is described in detail together with the calibration scheme, and image processing routines that enable the processing of the thermographs and extraction of quantitative temperature information from them, including local and global heat transfer rates. The resultant temperature fields and Nusselt number values are computed and validated against both standard empirical relations and numerical predictions. To date, LCT has not been used to determine Nusselt number for enclosed fluid systems. The ability of LCST to perform this task makes this novel experimental technique a useful tool.
1.
Braun, M. J., Dzodzo, M., and Lattime, S. B., 1993, “Automatic Computer Based Non-Intrusive Temperature Measurements in Laminar Natural Convection Using TLC in Enclosures with Variable Aspect Ratio,” Experimental and Numerical Flow Visualization, ASME, FED-Vol. 172, pp. 111–119.
2.
Farina
, D. J.
, Hacker
, J. M.
, Moffat
, R. J.
, and Eaton
, J. K.
, 1994
, “Illuminant Invariant Calibration of Thermochromatic Liguid Crystals
,” Exp. Therm. Fluid Sci.
, 9
, pp. 1
–12
.3.
Parsely, M., 1993, company literature, Hallcrest Products Inc., Glenview IL.
4.
Rhee
, H. S.
, Koseff
, J. R.
, and Street
, R. L.
, 1984
, “Flow Visualization of a Recirculating Flow by Rheoscopic Liquid and Liquid Crystal Techniques
,” Exp. Fluids
, 2
, pp. 57
–64
.5.
Nishimura
, T.
, Fujiwara
, M.
, and Miyashita
, H.
, 1992
, “Visualization of Temperature Fields and Double-Diffusive Convection Using Liquid Crystals in an Aqueous Solution Crystallizing Along a Vertical Wall
,” Exp. Fluids
, 12
, pp. 245
–250
.6.
Dabiri
, D.
, and Gharib
, M.
, 1991
, “Digital Particle Image Thermometry: The Method and Implementation
,” Exp. Fluids
, 11
, pp. 77
–86
.7.
Kimura, I., Takamori, T., Ozawa, M., Takenaka, N., and Sakaguchi, T., 1990, Simultaneous Measurement of Flow and Temperature Fields Based on Color Image Information, Flow Visualization, R. Reznicek, ed. Hemisphere Publishing, Washington, pp. 29–34.
8.
Ashforth-Frost, S., and Jambunathan, K., 1993, Flow Visualization Using Liquid Crystals, SPIE, Vol. 2005, pp. 237–245.
9.
Ozawa
, M.
, Mu¨ller
, U.
, Kimura
, I.
, and Takamori
, T.
, 1992
, “Flow and Temperature Measurement of Natural Convection in a Hele-Shaw Cell Using a Thermo-Sensitive Liquid-Crystal Tracer
,” Exp. Fluids
, 12
, pp. 213
–222
.10.
Mukherjee, D. K., 1999, “Computer-Assisted Liquid Crystal Thermography in a Rotating System: Application to Czochralski Crysal Growth,” Ph.D. thesis, State University of New York at Stony Brook.
11.
Mukherjee
, D. K.
, Prasad
, V.
, Dutta
, P.
, and Yuan
, T.
, 1996
, “Liquid Crystal Visualization of the Effects of Crucible and Crystal Rotation on CZ Melt Flows
,” J. Cryst. Growth
, 169
, pp. 136
–146
.12.
Kowalewski, T. A., and Stasiek, J., 1998, “Thermochromic Liquid Crystals in Heat Transfer Research, X” Heat Mass Transfer Symposium, Swieradow, 1, pp. 407–424.
13.
Sakakibara
, J.
, and Adrian
, R. J.
, 1999
, “Whole Field Measurement of Temperature in Water Using Two-Color Laser Induced Fluorescence
,” Exp. Fluids
, 26
, pp. 7
–15
.14.
Hiller, W. J., and Kowalewski, T. A., 1987, Simultaneous Measurement of Temperature and Velocity Fields in Thermal Convective Flows, Flow Visualization IV, Claude Veret, ed. Hemisphere Publishing, New York, pp. 617–622.
15.
Hiller
, W. J.
, and Kowalewski
, T. A.
, 1989
, “Three-Dimensional Structures in Laminar Natural Convection in a Cubic Enclosure
,” Exp. Therm. Fluid Sci.
, 2
, pp. 34
–44
.16.
Wisniewski, T. S., Kowalewski, T. A., and Rebow, M., 1998, “Infared and LCT in Natural Convection,” 8th Int. Symposium on Flow Visualization, Sorrento, G. M. Carlomagno and I. Grant, eds. CD ROM Proceedings ISBN 0953399109, pp. 212.1–212.8, Edinburgh.
17.
Gonzalez, R. C., and Woods, R. E., 1993, Digital Image Processing, Addison-Wesley Publishing Company, Reading, MA.
18.
Lutjen, P. M., 1999, “Three Dimensional Measurement of Temperature Fields Using Liquid Crystal Scanning Tomoscopy,” Master thesis, State University of New York at Stony Brook.
19.
Mallinson
, G. D.
, and de Vahl Davis
, G.
, 1977
, “Three-Dimensional Natural Convection in a Box: A Numerical Study
,” J. Fluid Mech.
, 83
, pp. 1
–31
.20.
Gebhart, B., Jaluria, Y., Mahajan, R. L., and Sammakia, B., 1988, Buoyancy-Induced Flows and Transport, Hemisphere Publishing Corp., New York.
21.
Chatterjee, A., 1998, “Three-Dimensional Adaptive Finite Volume Scheme for Transport Phenomena in Material Processing: Application to Czochralski,” Doctorate dissertation, State University of New York at Stony Brook, NY.
22.
Chen
, Q. S.
, Prasad
, V.
, and Chatterjee
, A.
, 1999
, “Modeling of Fluid Flow and Heat Transfer in a Hydrothermal Crystal Growth System: Use of Fluid Superposed Porous Layer Theory
,” Journal of Heat Transfer
, 121
, pp. 1049
–1058
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