Heat Transfer Analysis and Estimation of CHF in Vertical Channel
الموضوعات :
K. Dolati Asl
1
(Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas,, Iran)
E. ‎ Abedini‎
2
(Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas,, Iran)
Y. Bakhshan‎
3
(Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas,, Iran)
A. Mohammadi Karachi‎
4
(Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas,, Iran.)
R. Hamidi Jahromi
5
(Department of Mechanical Engineering, University of Hormozgan, Bandar Abbas,, Iran.)
الکلمات المفتاحية: Simulation, Two-phase flow, Critical Heat Flux, Boiling,
ملخص المقالة :
Heat transfer occurs in flow boiling; as a result, the amount of heat between the tube wall surface and the fluid at different points of the tube may vary depending on the volume percent of vapor at those points. If the flow is fully vaporized, it does not allow for perfect heat transfer at that point; this significantly increases the temperature there; in this case the applied heat flux is called critical heat flux (CHF). The present paper has focused its attentions on simulating atwo-phase fluid flow within the CHF range using ANSYS Fluent. The simulation results indicated an average error below 7%, which is more than those obtained by the experimental results. The maximum temperature of the tube surface when applying CHF could range between 200 and 500 K degrees more than that of fluid saturation according to the fluid working conditions. It also should be noted that both CHF and maximum temperature increase as the input pressure and mass flux do increase.
[1] Kim, S.J., McKrell, T., Buongiorno, J. and Hu, L.W., 2009. Experimental study of flow critical heat flux in alumina-water, zinc-oxide-water, and diamond-water nanofluids. Journal of Heat Transfer, 131(4), p.043204.
[2] Chen, E., Li, Y. and Cheng, X., 2009. CFD simulation of upward subcooled boiling flow of refrigerant-113 using the two-fluid model. Applied Thermal Engineering, 29(11-12), pp.2508-2517.
[3] Ose, Y. and Kunugi, T., 2011. Development of a boiling and condensation model on subcooled boiling phenomena. Energy Procedia, 9, pp.605-618.
[4] Krepper, E. and Rzehak, R., 2011. CFD for subcooled flow boiling: Simulation of DEBORA experiments. Nuclear Engineering and Design, 241(9), pp.3851-3866.
[5] Krepper, E., Končar, B. and Egorov, Y., 2007. CFD modelling of subcooled boiling—concept, validation and application to fuel assembly design. Nuclear Engineering and Design, 237(7), pp.716-731.
[6] Krepper, E., Rzehak, R., Lifante, C. and Frank, T., 2013. CFD for subcooled flow boiling: Coupling wall boiling and population balance models. Nuclear engineering and design, 255, pp.330-346.
[7] Kurul, N., 1991. On the modeling of multidimensional effects in boiling channels. ANS. Proc. National Heat Transfer Con. Minneapolis, Minnesota, USA, 1991.
[8] Nasiri, M. and Mahdi Rashidi, M., 2015. Numerical study of Subcooled Flow boiling of Water-Al 2 O 3 in vertical sinusoidal wavy channel. Modares Mechanical Engineering, 14(11).
[9] Alimoradi, H., Shams, M. and Valizadeh, Z., 2017. The effects of nanoparticles in the subcooled boiling flow in the channels with different cross-sectional area and same hydraulic diameter. Modares Mechanical Engineering, 16(12), pp.545-554.
[10] M. Mohammadi, M. Khayat, Experimental investigation of the effect of roughness orientation of surface on motion of bubbles and critical heat flux, Modares Mechanical Engineering, Vol. 17, No. 12, pp. 531-541, 2018.
[11] Wang, Y., Deng, K., Wu, J., Su, G. and Qiu, S., 2018. The characteristics and correlation of nanofluid flow boiling critical heat flux. International Journal of Heat and Mass Transfer, 122, pp.212-221.
[12] G. Celata, M. Cumo, A. Mariani, Burnout in highly subcooled water flow boiling in small diameter tubes, International Journal of Heat and Mass Transfer, vol. 36, pp. 1269-1285, 1993.
[13] Ioilev, A., Samigulin, M., Ustinenko, V., Kucherova, P., Tentner, A., Lo, S. and Splawski, A., 2007, September. Advances in the modeling of cladding heat transfer and critical heat flux in boiling water reactor fuel assemblies. In Proc. 12th International Topical Meeting on Nuclear Reactor Thermal Hydraulics (NURETH-12), Pittsburgh, Pennsylvania, USA.
[14] Tolubinsky, V.I. and Kostanchuk, D.M., 1970. Vapour bubbles growth rate and heat transfer intensity at subcooled water boiling. In International Heat Transfer Conference 4 (Vol. 23). Begel House Inc.
[15] Del Valle, V.H. and Kenning, D.B.R., 1985. Subcooled flow boiling at high heat flux. International Journal of Heat and Mass Transfer, 28(10), pp.1907-1920.
[16] Lemmert, M. and Chawla, L.M., 1977. Influence of flow velocity on surface boiling heat transfer coefficient in Heat Transfer in Boiling. Academic Press and Hemisphere, New York, NY, USA.
