Analysis of Engine Oil Cooler of An Unmanned Aero-Engine Atvarious Altitudes

Analysis of Engine Oil Cooler of An Unmanned Aero-Engine Atvarious Altitudes

P.K.Sarma D.Radha Krishna C.P.Ramanarayanan V.DharmaRao V.Srinivas 

GITAM University, Visakhapatnam, INDIA

Vehicle Research & Development Establishment, Ahmednagar, INDIA,

GVP College of Engineering, Visakhapatnam-530048, INDIA

Corresponding Author Email:
30 June 2012
| Citation



The present analysis is essentially a theoretical approach to establish the performance characteristics of engine oil cross flow heat exchanger with cold air as the unmixed coolant at different altitudes of the flight. The present configuration of the heat exchanger is a specific case being used by Vehicle Research Development Establishment (VRDE). The study takes into account the thermo- physical property variation of engine oil with respect to temperature in the oil ducts. The predictions from theoretical considerations are compared with the conventional empirical equations available in heat transfer handbooks. It is observed that the theoretical results related to effectiveness of heat exchanger deviate markedly from results of computational procedures found in the heat transfer data books. Further, the present analytical approach is rendered into a dimensionless correlation .The outlet temperature estimates from the analytical study for the engine oil and cold air at different altitudes agree very satisfactorily with the corresponding values from the proposed correlation equation.


Mixed cross flow heat exchanger, property variation, altitude effects on effectiveness

1. Introduction
2. Formulation
3. Results and Discussion

[1] Kays, W. M., and A. L. London, 1998, Compact Heat Exchangers, reprint, 3d ed., Krieger, publishing house.

[2] W.M. Rohsnow., J.P. Hartnett. and Y.I. Cho., Hand book of heat transfer, 3rd Edition, McGraw hill publications.

[3] “Heat exchangers design hand book” edited by Ernst U. Schlunder, published by Taylor and Francis, 1983.

[4] Shah, R. K., and D. P. Sekulic, 2003, Fundamentals of Heat Exchanger Design, Wiley, Hoboken, N.J.

[5] C.P.Kothandaraman and S.Subramanyan ’Heat and Mass Transfer Data Book’, New Age International Publishers, New Delhi

[6] Webb, R. L., 1994, Principles of Enhanced Heat Transfer, Wiley, New York.

[7] R.K. Shah, A.L. London, in: Laminar Flow Forced Convection in Ducts, Academic Press Inc., New York, 1978, pp. 253–260.

[8] F.P. Incropera, D.P. Dewitt, in: Introduction to Heat Transfer, third ed., Wiley, New York, 1996, p. 416, Chapter 8.

[9] P.K.Sarma, D.Radha Krishna,V.Srinivas,V.Dharma Rao,C.P.Ramnarayananan, ‘An analytical approachto solve a cross flow heat exchanger for unmixed hot and cold media’ Heat and Technology ,Vol29.n.1.2011 Italy