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Journal of Energy in Southern Africa

On-line version ISSN 2413-3051
Print version ISSN 1021-447X

J. energy South. Afr. vol.22 n.3 Cape Town  2011


Experimental study on heat and mass transfer for heating milk



Mahesh KumarI; K S KasanaII; Sudhir KumarIII; Om PrakashIV

IMechanical Engineering Department, Guru Jambheshwar University of Science & Technology, Hisar, India
IIGalaxy Global Group of Institutions, Dinarpur, Ambala, Haryana, India
IIIMechanical Engineering Department, National Institute of Technology, Kurukshetra, India
IVMechanical Engineering Department, National Institute of Technology, Patna, India




In this paper, an attempt has been made to estimate the convective heat transfer coefficient for sensible heating of milk in a stainless steel pot during khoa, made by traditional method. Various indoor experiments were performed for simulation of a developed thermal model for maximum evaporation by varying heat inputs from 240 watts to 420 watts. The experimental data was used to determine values of constants in the well known Nusselt expression by simple linear regression analysis and, consequently, convective heat transfer coefficients were determined. It is found that the convective heat transfer coefficients decrease with an increase in rate of heating. The experimental error in terms of percent uncertainty was also evaluated.

Keywords: khoa making, milk heating, sensible heating, convective heat transfer coefficient



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Pal, D. (2008). New innovations in the processing of traditional Indian dairy products. Indian Dairyman, 60(3), 127-131.         [ Links ]

Kumar, M., Prakash, O., Kasana, K.S. and Dabur, R.S. (2010). Technological advancement in khoa making. Indian Dairyman, 62(1), 64-70.         [ Links ]

Dunkle, R.V (1961). Solar water distillation: the roof type still and a multiple effect diffusion still, International Development in Heat Transfer, ASME, Proc. International Heat Transfer, Part V, University of Colorado, 895-902.         [ Links ]

Clark, J.A. (1990). The steady state performance of a solar still. Solar Energy 44, 43-49.         [ Links ]

Tiwari, G.N. and Lawrence, S.A. (1991). New heat and mass transfer relations for a solar still. Energy Conversion Management 31, 201-203.         [ Links ]

Adhikari, R.S., Kumar, A. and Kumar, A. (1990). Estimation of mass transfer rates in solar stills. Energy Res. 14, 737-744.         [ Links ]

Adhikari, R.S., Kumar, A. and Sodha, M.S. (1991). Thermal performance of a multi-effect diffusion solar still. Energy Res.15, 769-779.         [ Links ]

Adhikari, R.S., Kumar, A. and Sotha, G.D. (1995). Simulation studies on a multi stage tray solar still. Solar Energy 54(5), 317-325.         [ Links ]

Kumar, S. and Tiwari, G.N. (1996). Estimation of convective mass transfer in solar distillation system. Solar Energy 57(6), 459-464.         [ Links ]

Tiwari, G.N., Minocha, A., Sharma, PB. and Khan, M.E. (1997). Simulation of convective mass transfer in solar distillation process. Energy Conversion Management 38(8), 761-770.         [ Links ]

Tiwari, G.N., Kumar, S. and Prakash, O. (2003). Study of heat and mass transfer from sugarcane juice for evaporation. Desalination 159, 81-96.         [ Links ]

Kumar, M., Prakash, O. and Kasana, K. S. (2011). An experimental study on pool boiling of milk. Heat transfer - Asian research, 40(2), 159-170.         [ Links ]

Anwar, S.I. and Tiwari, G.N. (2001). Evaluation of convective heat transfer coefficient in crop drying under open sun drying conditions. Energy Conversion Management 42(5), 627-637.         [ Links ]

Nakra, B.C. and Chaudhary, K.K., 'Instrumentation, measurement and analysis', Tata McGraw Hill, New Delhi, (1985), 33.         [ Links ]

Prakash, S., Datta, N. and Deeth, H.C. (2005). Methods of detecting fouling caused by heating of milk. Food Reviews International 21, 267-293.         [ Links ]

Jun, S. and Puri, V.M. (2005). Fouling models for heat exchangers in Dairy Processing: a review. Journal of Food process Engineering. 28, 1-34.         [ Links ]

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