Experimental Estimation of Heat Transfer Coefficients Using Helical Coil in an Agitated Vessel

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2012 by IJETT Journal
Volume-3 Issue-2                          
Year of Publication : 2012
Authors :  Ashok Reddy K , Bhavanth Rao M ,Ram Reddy P


Ashok Reddy K , Bhavanth Rao M ,Ram Reddy P. " Experimental Estimation of Heat Transfer Coefficients Using Helical Coil in an Agitated Vessel". International Journal of Engineering Trends and Technology (IJETT). V3(2):113-122 Mar-Apr 2012. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group


A mathematical model is developed to analyze the heating rates and compare the relation with experimental results obtained in our present study . Low shear rate concentration of sodium carboxymethal cellulose fluids with two different coil length s 2.362m and 2.82m, diameter of the helical coil equal to 156mm , d i =4.0mm and d o = 6.4mm were used to correlate overall heat transfer coefficients in an agitated vessel with four blade paddle impeller. The model is derived by using velocity flow field and energy equations in cylindrical coordinate for straight tube and later extended to helical coil. The new design relation for obtaining the individual heat transfer coefficient in terms of flow behavior index is equal to Nu=[(280n 3 + 296n 2 + 88n +8)/ (31n 3 + 43n 2 + 13n +1)] .


[1] . S M C P Pedrosa and J R Nunhez Improving heat transfer in Stirred tanks cooled by helical coils Brazilian Journal of Chemical Engineering 20 2003 [links]
[2] M T Dhotre Z V P Murthy and N S Jayakumar Modelling and Dynamic studies of heat transfer of liquid in half coil jackets Chemical Eng g. J ournal 118 2006 p183
[3] V T Perarasu, M Arivazhagan and P Sivahanmugam Heat Transfer Studies in Coiled Agitated Vessel International Journal of Food Engineering 7 2011 p1
[4] B Lakghomi E Kolahchian A Jalai F Farhadi Coil and Jacket’s Effects on Internal Flow & Heat Transfer in Stirred Tanks World Academy of Science Engg and Tech. 24 2006 p147
[5] Y P Setty and N S Jayakumar Heat Transfer studies using Half - Coil Jacket . Indian Chemical Engineer. Section A 41 1999 T27.
[6] .J F Seara F J Uhia J Sieres and A Campo A general rewview of the Wilson plot method and its modification to determine convection coefficient s in heat exchange devices Applied Thermal Engineering 27 2007 p2745
[7] A M Mondal J A Naser and A K M A Quader Laminar Heat Transfer to Time - Independent Non - Newtonian Fluids in Tubes Indian Chemical Engineer Secti on A 39 1997 T27
[8] S C Arora S Domkundwar A V Domkundwar A Course in Heat & Mass Transfer Dhanpat Rai & Co (p) ltd 2003 p12.7 & p13.7
[9] W L McCabe J C Smith and P Harriott U nit Operations of Chemical Engineering 7 th Edition 2005 McGraw - Hill Chemical Engineering Series p104
[10] . K Ashok Reddy Heat Transfer to Non - Newtonian Fluids in Agitated Vessel with Paddle Impeller PhD Thesis Jawaharlal Nehru Technological University Hyderabad
[11] R K Jha and M Raja Rao Heat Transfer t hrough coiled tubes in agitated . Vessel. Int ernational Journal Heat Mass Transfer 10 1969 p395

Helical coil, Heat Transfer Agitated Vessel