An experimental investigation on heat transfer for different parameters in centripetally located boiling agitation vessels

Yıl 2012, Cilt: 16 Sayı: 2, 99 - 105, 01.08.2012

Ufuk Durmaz Mustafa Özdemir

Öz

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Anahtar Kelimeler

Heat transfer, aqueous sugar solutions, agitation vessels, pool boiling

Merkezcil karıştırıcılı kaynatma tanklarında ısı geçişinin farklı parametreler için deneysel incelenmesi

Öz

In this study, the effects of blade size, agitation speed and the gap between the blade and the bottom surface on heat transfer rate in centripetally located boiling agitation vessels are aimed to investigate by experimentally. Aqueous sugar solutions at constant pressure and different temperatures were used for boiling experiments. The experiments were performed using 3 different agitator speeds, 2 different gaps and 3 different sized blades. It was seen that the heat transfer rate is depending on sugar concentration, agitator speed and the gap. Also, the process time and the capacity variations depending on the radius for boiling vessels were examined for the half-sphere heating surface.

Anahtar Kelimeler

Isı geçişi, sulu şeker çözeltileri, karıştırıcılı tanklar, havuz kaynaması

Kaynakça

• Holven A.L., "Sucrose solutions: influence of pressure on boiling point elevation", Ind Eng Chem, 28 abr., 452-455, 1936.
• Perez A.M, Macedo E.A., "A modified UNIFAC model forthe calculation of thermodynamic properties of aqueous and non-aqueous solutions containing sugar", Fluid Phase Equilib, 139-474, 1997.
• Triveni B., Vishwanadham B., Venkateshwar S., "Studies on heat transfer to Newtonian and non- Newtonian fluids in agitated vessel", Heat and Mass Transfer, 44, 1281-1288, 2008.
• Lakghomi B., Kolahchian E., Jalali A., Ferhadi F., "Coil and Jacket's Effects on Internal Flow Behavior and Heat Transfer in Stirred Tanks", Wordl Acedemy of Science, Engineering and Technology 24, 147-151, 2006.
• Kawase Y., Hoshino M., Takahashi T., "Non Newtonian laminar boundary layer heat transfer in stirred tanks" Heat and Mass Transfer, n. 38, p. 679- 686, 2002.
• Kays W.M., Crawford M. E., Weigand B., "Convective heat and mass transfer", 4th edition, Boston: McGraw- Hill, 2005.
• Rohsenow, W. M., "A method of correlating heat transfer data for surface boiling of liquids", Trans ASME, 74, 969-976, 1952.
• Nukiyama, S., "The maximum and minimum values of heat Q transmitted from metal to boiling water under atmosferic pressure", J Jpn Soc Mech Eng, 37, 367- 374, 1934.
• Özdemir M., Pehlivan H., "Prediction of the boiling temprerature and heat flux in sugar-water solutions under pool boiling conditions", Heat and Mass Transfer, 44, 827-833, 2008.
• Hahne E., Barthau G., "Heat transfer and nucleation in pool boiling" International J Therm Sci, n. 45, p. 209- 216, 2006.
• Kotthoff S, Gorenflo D., Danger E., Luke A., "Heat transfer and bubble formation in pool boiling:effect of basic surface modification for heat transfer enhancement", Int J Therm Sci, 45, 217-236, 2006.
• Jeschar R., Alt R., Specht E., "Grundlagen der Warmeübertragung", Goslar, 1990.