Mechanization in agriculture & Conserving of the resources
Vol. 68 (2024), Issue 4, pg(s) 122-124

MECHANIZATION IN AGRICULTURE

Optimization of vertical surfaces with continuous and discrete finning

  • 1 National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine

Abstract

The article deals with the optimization of vertical surfaces with continuous and discrete finning under conditions of natural convection. The optimization was carried out using experimental data obtained for finned surfaces made of steel, taking into account the non-isothermal temperature distribution over the surface of continuous and discrete fins. The dependences of the optimal distance between the ribs on the Rayleigh number and the geometric dimensions of the ribs are found. It was found that with a decrease in the Rayleigh number for discrete non-isothermal fins, the optimal distance between the fins increases compared to the same distance for continuous non-isothermal fins. The differences can be more than 30%. The obtained results for continuous non-isothermal fins are compared with the known results for isothermal fins. It is shown that the presence of non-isothermicity on the surface of continuous fins made of metal materials leads to the need to reduce the inter-fin distance by up to 40%. The results obtained can be useful in the design of finned surfaces under natural convection conditions.

Keywords

References

  1. Elenbaas, W. Heat dissipation of parallel plates by free convection. Phisica 9(1), 1–28 (1942).
  2. Chaddok, J.B. Free convection heat transfer from vertical rectangular fin arrays. ASHRAS Journal 7(8), 53–60 (1970).
  3. Osterle, J.F., Young, F.J. Natural convection between heated vertical plates in a horizontal magnetic field. Journal of Fluid Mechanics 11(4), 512–518 (1961). https://doi.org/10.1017/S002211206100069X.
  4. Semenyuk, V.A. Optimal distance between the fins of the plate radiators cooled by natural convection. Question of radio electronics 3, 44–51 (1973).
  5. Levi, E.K. Optimal distance between plates at heat transfer by natural convection from parallel isothermal plates under laminar regime. Heat Transfer. 4, 141-148 (1971).
  6. Bar-Cohen, A., Rosenau, V.M. Thermally optimal gap between vertical parallel plates cooled by free convection. Heat Transfer 1, 114-122 (1984).
  7. Burch T., Rhodes T., Acharya. Laminar natural convection between finitely conducting vertical plates. International Journal of Heat and Mass Transfer 28(6), 1173-1186 (1985) https://doi.org/10.1016/0017-9310(85)90125-5
  8. Beckett, P.M., Friend, I.E. Combine natural and forced convection between parallel wall; developing flow at higher Rayleigh numbers. International Journal of Heat and Mass Transfer 27(4) 611-621 (1984) https://doi.org/10.1016/0017- 9310(84)90033-4
  9. Acharya, S., Mehrotra, A. Natural convection in smooth and ribbed vertical channel. International Journal of Heat and Mass Transfer 36(1), 236-241 (1993) https://doi.org/10.1016/0017- 9310(93)80085-9
  10. Ramanathan, S., Kumar, R. Correlation for natural convection between heated vertical plates. Modern Engineering. Ser.A 9, 1-12 (1991).
  11. Treputnev, V.V., Gorobets, V.G. Experimental study of heat transfer of vertical surfaces with continuous finning under natural convection. Industrial Heat Engineering 6, 19-24 (1998).
  12. Sparrow, E.M., Prakash, K. Intensification of heat transfer by free convection in staggered rows of vertical discrete plates. Heat Transfer 102(2), 34-41 (1980).
  13. O'Meara, T., Poulikakos, D. Experimental on the cooling by natural convection of on array of vertical heated plates with constant heat flux. International Journal of Heat and Mass Transfer 8(4), 313-319 (1987) https://doi.org/10.1016/0142- 727X(87)90067-1.
  14. Gorobets, V.G., Treputnev, V.V. Experimental study of heat transfer of vertical surfaces with discrete finning under natural convection. Industrial Heat Engineering 1, 55-60 (1999).
  15. Shen, Q., Sun, D., Xu, Y., Jin, T., Zhao, X. Orientation effects on natural convection heat dissipation of rectangular fin heat sinks mounted on LEDs. International Journal of Heat and Mass Transfer 75, 462-469 (2014) https://doi.org/10.1016/j.ijheatmasstransfer.2014.03.085.
  16. Li, B., Jeon, S., Byon, C. Investigation of natural convection heat transfer around a radial heat sink with a perforated ring. International Journal of Heat and Mass Transfer 97, 705-711 (2016) https://doi.org/10.1016/j.ijheatmasstransfer.2016.02.058.
  17. Feng, S., Shi, M., Yan, H., Sun, S., Li, F., Lu, T.J. Natural convection in a cross-fin heat sink. Applied Thermal Engineering 132, 30-37 (2018) https://doi.org/10.1016/j.applthermaleng.2017.12.049.
  18. Ahmed, H.E., Salman, B.H., Kherbeet, A.Sh., Ahmed, M.I. Optimization of thermal design of heat sinks: A review. International Journal of Heat and Mass Transfer 118, 129-153 (2018) https://doi.org/10.1016/j.ijheatmasstransfer.2017.10.099.
  19. Zhang, K., Li, M.-J., Wang, F.-L., He, Y.-L. Experimental and numerical investigation of natural convection heat transfer of W-type fin arrays. International Journal of Heat and Mass Transfer 152, 119315 (2020) https://doi.org/10.1016/j.ijheatmasstransfer.2020.119315.

Article full text

Download PDF