THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

NUMERICAL HEAT TRANSFER MODEL FOR FROST PROTECTION OF CITRUS FRUITS BY WATER FROM A SPRAYING SYSTEM

ABSTRACT
A simplified model is developed to simulate the conditions associated with the protection of fruits from frost damage using water from a spraying system. The model simulates the movement of the solidifying water front on a single fruit, and based on that determines the spray frequency needed for a water film to continuously surround the ice-coated fruit to prevent the fruit temperature from dropping below 0ºC. Simulations are presented for the frost protection of sweet oranges (citrus sinensis). The effect of environmental conditions such as air temperature, air velocity, surface radiation and water film evaporation on the development of the ice layer encasing is considered. Simulations show the effect the encasing ice sheet thickness has on the fruit temperature if water from a spraying system is turned off permanently. Experimental tests are also conducted to determine the change in the thermal properties of citrus sinensis for operating temperatures that range from above freezing to sub-freezing. The results of the experimental tests and the numerical simulations shall lead to a better understanding of fruit protection from frost damage by the application of water from a spraying system.
KEYWORDS
PAPER SUBMITTED: 2011-03-31
PAPER REVISED: 2011-04-07
PAPER ACCEPTED: 2011-08-11
DOI REFERENCE: https://doi.org/10.2298/TSCI110331084I
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 1, PAGES [31 - 42]
REFERENCES
  1. Von Lengerke, H.J., On the Short-Term Predictability of Frost and Frost Protection - A Case Study on Dunsandle Tea Estate in the Nilgiris (South India), Agricultural Meteorology, 19 (1978), pp. 1-10
  2. Hamer, P.J.C., An Automatic Sprinkler System Giving Variable Irrigation Rates Matched to Measured Frost Protection Needs, Agricultural Meteorology, 21 (1980), pp. 281-293
  3. Hamer, P.J.C., The Heat Balance of Apple Buds and Blossoms. Part II - The Water Requirements for Frost Protection by Overhead Sprinkler Irrigation, Agricultural and Frost Meteorology, 37 (1986), pp. 159-174
  4. Hamer, P.J.C., Simulation of the Effects of Environmental Variables on the Water Requirements for Frost Protection by Overhead Sprinkler Irrigation, Journal of Agricultural Engineering Research, 42 (1989), pp. 63-75
  5. Edling, R.J., Constantin, R.J., and Bourgeois, W.J., Louisiana Citrus Frost Protection with Enclosures and Microsprinklers, Agricultural and Forest Meteorology, 60 (1992), pp. 101-110
  6. Anconelli, S., Facini, O., Marletto, V., Pitacco, A., Rossi, F., and Zinoni, F., Micrometeorological Test of Microsprinklers for Frost Protection of Fruit Orchards in Northern Italy, Physics and Chemistry of the Earth, 27 (2002), pp. 1103-1107
  7. Ghaemi, A.A., Rafiee, M.R., and Sepaskhah, A.R., Tree-Temperature Monitoring for Frost Protection of Orchards in Semi-Arid Regions Using Sprinkler Irrigation, Agricultural Sciences in China, 8 (2009), 1, pp. 98-107
  8. Stombaugh, T.S., Heinemann, P.H., Morrow, C.T., and Goulart, B.L., Automation of a Pulsed Irrigation System for Frost Protection of Strawberries, Applied Engineering in Agriculture, 8 (1992), pp. 597-602
  9. Zhitkevich, L.K., and Simchenko, L.E., Investigation of Local and Average Heat Transfer between a Sphere and an Airstream, Journal of Engineering Physics and Thermophysics, 11 (1966), 1, pp. 7-9
  10. Cary, J.R, The Determination of Local Forced Convection Coefficients for Spheres, Transactions of the American Society of Mechanical Engineers, 75 (1953), pp. 483-487
  11. Wadsworth, J., The Experimental Examination of the Local Heat Transfer on the Surface of a Sphere when Subjected to Forced Convective Cooling, Report No. MT-39, National Research Council of Canada, (1958)
  12. KD2 Pro Operator's Manual, Version 8, Decagon Devices, 2010
  13. Abramowitz, M, and Stegun, I.A., Handbook of Mathematical Functions, Dover Publications, Inc., New York, USA, 1972
  14. Mikielewicz, J., and Moszynski, J.R., Minimum Thickness of a Liquid Film Flowing Vertically Down a Solid Surface, International Journal of Heat and Mass Transfer, 19 (1976), pp. 771-776

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence