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Apichart Chaengbamrung
Department of Mechanical Engineering, Kasetsart University, Bangkok, 10900, Thailand

Amarin Tongkratoke
Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000 Thailand

Anchasa Pramuanjaroenkij
Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000 Thailand


This research studied heat transfer enhancement of a counter-flow heat exchanger by replacing a smooth inner tube with a spirally corrugated tube inside the heat exchanger. Results are obtained from the computational fluid dynamics (CFD) program. Performance of heat exchanger can be enhanced by increasing heat transfer area and increasing the turbulent intensity of fluid flow. A three-dimensional, steady, forced turbulent, and convectional flow model of fluid were developed in this research, water flowing inside smaller tube with an inner diameter of 20 mm., oil flowing in the annulus with the outer diameter of 76 mm., and domain length of 900 mm. The flow and physical parameters of the spirally corrugated tube; the corrugated pitch (p) and Reynolds number (Re) which affect friction factor (f) and Nusselt number (Nu) of the tube were studied in order to provide equations in which, later, was used to predict solutions numerically by calculating friction factor and Nusselt number of the tube. From the numerical results, we found that the friction factor depended on the corrugated pitch and Re as shown in the equation; f = −0.0091Re + 0.0715, and f = (3×10−5)p3 − 0.002p2 − 0.004p2 + 0.0043. However, the Nusselt number is expressed numerically as Nu = 89.93Re + 3.4578, and f = − 1.5674p3 − 20.217p2 − 84.042p2 +232.34. This simulation is valid for following ranges; 10000 < Re < 40000 and the pitch distances between 20 mm. and 120 mm.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH