THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Laminar forced convection in a cylindrical collinear ohmic sterilizer

ABSTRACT
The present work deals with a thermo-fluid analysis of a collinear cylindrical ohmic heater in laminar flow. The geometry of interest is a circular electrically insulated glass pipe with two electrodes at the pipe ends. For this application, since the electrical conductivity of a liquid food depends strongly on the temperature, the thermal analysis of an ohmic heater requires the simultaneous solution of the electric and thermal fields. In the present work the analysis involves decoupling the above fields by means of an iterative procedure. The thermal field has been calculated using an analytical solution, which leads to fast calculations for the temperature distribution in the heater. Some considerations of practical interest for the design are also given.
KEYWORDS
PAPER SUBMITTED: 2015-11-05
PAPER REVISED: 2016-05-14
PAPER ACCEPTED: 2016-05-24
PUBLISHED ONLINE: 2016-05-30
DOI REFERENCE: https://doi.org/10.2298/TSCI151105124P
REFERENCES
  1. Quarini, G.L., Thermal hydraulic aspects of the ohmic heating process, J Food Eng, 24 (1995), pp. 561-574. oi:10.1016/0260-8774(95)90770-C
  2. Varghese K.S., Pandey M.C., Radhakrishna K., Bawa A.S., Technology, applications and modelling of ohmic heating: a review, J Food Sci Tech Mys, 51 (2014), pp 2304-2317. doi: 10.1007/s13197-012-0710-3
  3. Sakr, M., Liu, S., A comprehensive review on applications of ohmic heating (OH), Renewable Sustainable Energy Rev 39 (2014), pp. 262-269. doi:10.1016/j.rser.2014.07.061
  4. Goullieux, A., Pain, J.P., Ohmic Heating. In Emerging technologies for food processing (Edited by Da Wen Sun), Chap. 18, Elsevier Academic Press, London (2005)
  5. de Alwin, A.A.P., Fryer, P.J., Operability of the ohmic heating process: electrical conductivity effects, J Food Eng, 15 (1992), pp. 21-48. doi:10.1016/0260-8774(92)90038-8
  6. Icier, F., Ilicali, C., Temperature dependent electrical conductivities of fruit purees during ohmic heating, Food Res Int, 38 (2005), pp. 1135-1142. doi:10.1016/j.foodres.2005.04.003
  7. Benabderrahmane, Y., Pain, J.P., Thermal behaviour of a solid/liquid mixture in an ohmic heating sterilizer - slip phase model, Chem Eng Sci, 55 (2000), pp. 1371-1384. doi:10.1016/ S0009-2509(99)00421-2
  8. Pesso, T. Piva, S., Laminar forced convection in a pipe with temperature dependent heat generation, J Appl Fluid Mech, 8 (2015), pp. 641-650.
  9. Lienhard IV, J.H., Lienhard V, J.H, A Heat Transfer Textbook, 3rd ed., available in the web