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Heat and Mass Transfer

, Volume 47, Issue 8, pp 899–910 | Cite as

Convective heat transfer and fluid flow physics in some ribbed ducts using liquid crystal thermography and PIV measuring techniques

  • Bengt SundénEmail author
Original

Abstract

Enhancement of forced convection is important in several engineering applications. Surface modifications like rib-roughening are commonly used in applications such as compact heat exchangers and internal cooling of gas turbine blades and vanes. This paper gives a brief summary of convective heat transfer and fluid flow in some ribbed ducts using liquid crystal thermography and PIV measuring techniques. Details of the flow pattern and the influence of rib configuration and arrangement on the heat transfer are presented. Nevertheless, the understanding of the flow and thermal physics in ribbed ducts is not yet complete and further studies are needed.

Keywords

Heat Transfer Heat Transfer Coefficient Particle Image Velocimetry Nusselt Number Heat Transfer Enhancement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

Area (m2)

e

Rib height (m)

h

Heat transfer coefficient (W/m2K)

H

Duct height (m)

Nu

Nusselt number

P

Rib pitch (m)

Pr

Prandtl number

Q

Power (W)

q

Heat flux (W/m2)

Re

Reynolds number

T

Temperature (K)

u, U

Velocity in x-direction (m/s)

u′

Fluctuating velocity in x-direction (m/s)

v′

Fluctuating velocity in y-direction (m/s)

W

Duct width (m)

x, y, z

Cartesian coordinates (m)

Subscripts

b

Bulk

DB

Dittus–Boelter

el

Electric

f

Frame

LC

Liquid crystal

loss

Loss

w

Wall

0

Reference value

Abbreviations

CCD

Charge coupled device

CFD

Computational fluid dynamics

FFT

Fast Fourier transformation

LC

Liquid crystal

LCT

Liquid crystal thermography

PIV

Particle image velocimetry

TLC

Thermochromic liquid crystal

Notes

Acknowledgments

Financial support from Swedish Research Council (VR) and Swedish Energy Agency (STEM) is kindly acknowledged. Collaborations with Alfa Laval, Nilcon Engineering, Volvo Aero and Valeo in various projects over several years are kindly acknowledged. Several PhD students and post docs have significantly contributed to the success of the projects. For some years, I was lucky to have the opportunity to cooperate with Professor Franz Mayinger and his co-workers in an IEA research programme on Heat Transfer and Heat Exchangers. It was an extremely stimulating and successful opportunity to have a chance to cooperate with such a dignity in heat transfer and thermal engineering topics as well measuring techniques. I wish Professor Mayinger all the best, many pleasant and healthy years to come.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Department of Energy Sciences, Division of Heat TransferLund UniversityLundSweden

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