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Double tube heat exchanger with novel enhancement: part I—flow development length and adiabatic friction factor

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Abstract

The study is conducted to evaluate the flow characteristics in a double tube heat exchanger using two new and versatile enhancement configurations. The novelty is that they are usable in single phase forced convection, evaporation and condensation. Correlations are proposed for flow development length and friction factor for use in predicting fluid pumping power in thermal equipment as well as in subsequent heat transfer characterization of the surface.

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Abbreviations

d o :

Inner tube outer diameter (m)

D i :

Outer tube inner diameter (m)

D h :

Hydraulic diameter based on wetted perimeter (m)

f :

Fanning friction factor

\( f_{\text{app}} \) :

Mean apparent Fanning friction factor

L :

Length (m)

\( r^{*} \) :

Non-dimensional radial coordinate (Eq. 7)

\( r_{\text{m}}^{*} \) :

Non-dimensional radial coordinate (Eq. 6)

ΔP :

Pressure difference (Pa)

Re :

Reynolds number based on hydraulic diameter (Re = ρVD h/μ)

Re c :

Critical Reynolds number corresponding to the onset of turbulence

V :

Mean velocity in the tube (m/s)

x :

Flow length in a tube, or distance measured along the surface of a body (m)

X + :

Non-dimensional axial distance (x/(D·Re))

X fd,h :

Hydrodynamic development length

X hd,l :

Laminar flow development length

X hd,t :

Turbulent flow development length

Ρ :

Density, evaluated at bulk temperature (kg/m3)

μ:

Dynamic viscosity of water (Pa s)

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Acknowledgments

The authors thank Universiti Teknologi PETRONAS for support in this research work. They are also indebted to O.Y.L. Research & Development Center Sdn. Bhd. for funding this research.

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  1. Faculty of Mechanical Engineering, Universiti Teknologi PETRONAS, Tronoh, Malaysia

    R. Tiruselvam & Vijay R. Raghavan

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  1. R. Tiruselvam
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  2. Vijay R. Raghavan
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Correspondence to Vijay R. Raghavan.

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Tiruselvam, R., Raghavan, V.R. Double tube heat exchanger with novel enhancement: part I—flow development length and adiabatic friction factor. Heat Mass Transfer 48, 641–651 (2012). https://doi.org/10.1007/s00231-011-0915-4

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