DETERMINATION OF FORCED CONVECTION HEAT TRANSFER OF NON NEWTONIAN FLUIDS IN AGITATED VESSELS WITH PITCHED TURBINE MIXER

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HAMIDI ALI ASGHAR; SHAFIEI K.

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Journal: Year:2007 | Volume:41 | Issue:2 (104) Page(s): 159-166

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Title

DETERMINATION OF FORCED CONVECTION HEAT TRANSFER OF NON NEWTONIAN FLUIDS IN AGITATED VESSELS WITH PITCHED TURBINE MIXER

Author(s)

HAMIDI ALI ASGHAR | SHAFIEI K. | Issue Writer Certificate

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Abstract

Up to now, the heat transfer coefficient for a number of non-Newtonian fluids in various combinations of vessel/agitator has been investigated. These types of fluids have a wide variety of applications and uses in the industry. Among these applications, exothermic polymerization reactions, production of resins and lacquers and many other applications require heat transfer to non-Newtonian fluids either for chemical reaction or for reduction of viscosity in the process. Therefore, knowledge of heat transfer coefficient in these systems is important in the design and operation of such systems. In the present investigation, using an experimental set up consisting of a jacketed vessel, a pitched turbine agitator with variable speed motor, a 2000 W electric heater situated in the middle of the vessel as the source of heat for the system and instrumentation, systems for the measurement of cooling water flow rate and local and bulk temperatures, heat transfer coefficient for non-Newtonian fluids has been measured. All thermocouples have bean calibrated according to BSEN 60751- 1996 standards and proved to have an error of ±0.1°C. Parameters such as the concentration of Zanthan gum in water (non-Newtonian fluid solution of 0.2, 0.3 and 0.5%) and the speed of rotation of the agitator (200, 300, 400, 500 and 600 rpm) have been varied and the findings of various experiments were noted giving special attention to the viscosity of the solution and its effects. A power law relation was derived for the apparent viscosity of the non-Newtonian fluid as a function of the rotation speed and the temperature. By the use of dimensional analysis, an empirical equation was derived relating Reynolds, Prandtl and viscosity numbers to the Nusselt number and hence the variation of heat transfer coefficient was indicated as a function of the most important operating parameters. The investigation included Reynolds number in the range 300 - 66000. Correlation is in the usual form of Nusselt number as a function of multiplications of Reynolds, Prandtl and viscosity number. The power of Prandtl number has been taken as 0.33 which is according to what has been indicated in most of the literature for similar cases. However, the power for Reynolds and viscosity numbers as well as the correlation constant was determined from the experimental data. The final from of this experimental correlation is Nu=0.935 Re 0.62 Pr 0.33 vi 182 This correlation shows a good agreement (over 90%) with the experimental data.

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APA: Copy

HAMIDI, ALI ASGHAR, & SHAFIEI, K.. (2007). DETERMINATION OF FORCED CONVECTION HEAT TRANSFER OF NON NEWTONIAN FLUIDS IN AGITATED VESSELS WITH PITCHED TURBINE MIXER. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 41(2 (104)), 159-166. SID. https://sid.ir/paper/14221/en

Vancouver: Copy

HAMIDI ALI ASGHAR, SHAFIEI K.. DETERMINATION OF FORCED CONVECTION HEAT TRANSFER OF NON NEWTONIAN FLUIDS IN AGITATED VESSELS WITH PITCHED TURBINE MIXER. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;41(2 (104)):159-166. Available from: https://sid.ir/paper/14221/en

IEEE: Copy

ALI ASGHAR HAMIDI, and K. SHAFIEI, “DETERMINATION OF FORCED CONVECTION HEAT TRANSFER OF NON NEWTONIAN FLUIDS IN AGITATED VESSELS WITH PITCHED TURBINE MIXER,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 41, no. 2 (104), pp. 159–166, 2007, [Online]. Available: https://sid.ir/paper/14221/en

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