Imperial College London
Professor John Christos Vassilicos

ProfessorJohn ChristosVassilicos

Faculty of Engineering, Department of Aeronautics

Visiting Professor
 
 
 
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Contact

 

+44 (0)20 7594 5137j.c.vassilicos

 
 
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Assistant

 

Miss Jackie O'Neill +44 (0)20 7594 5079

 
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Location

 

CAGB 314City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Melina:2018:10.1016/j.ijheatmasstransfer.2018.03.019,
author = {Melina, G and Bruce, PJK and Nedi, J and Tavoularis, S and Vassilicos, C},
doi = {10.1016/j.ijheatmasstransfer.2018.03.019},
journal = {International Journal of Heat and Mass Transfer},
pages = {1068--1086},
title = {Heat transfer from a flat plate in inhomogeneous regions of grid-generated turbulence},
url = {http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.03.019},
volume = {123},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Experiments on the convective heat transfer from a flat plate, vertically mounted and parallel to the flow in a wind tunnel, were carried out via Infra-Red thermography and hot-wire anemometry. The Reynolds number based on the inflow velocity and on the length of the plate was about 5×1055×105. A step near the leading edge of the plate was used to promote transition to turbulence, with tripping effects on the heat transfer coefficients shown to be negligible for more than 90% of the plate’s length. Different types of grids, all with same blockage ratio σg=28%σg=28%, were placed upstream of the plate to investigate their potential to enhance the turbulent heat transfer. These grids were of three classes: regular square-mesh grids (RGs), single-square grids (SSGs) and multi-scale inhomogeneous grids (MIGs). The heat transfer coefficients at the mid-length of the plate were correlated with the mean velocity and the turbulence intensity of the flow at a distance from the plate at which the ratio of the standard deviations of the streamwise and wall-normal velocity fluctuations began to increase. However, the heat transfer was shown to be insensitive to the turbulence intensity of the incoming flow in close proximity of the tripping step. Furthermore, the integral length scale of the streamwise turbulent fluctuations was found not to affect the heat transfer results, both near the tripping step and in the well-developed region on the plate. For the smallest plate-to-grid distance, the strongest heat transfer enhancement (by roughly 30%) with respect to the no-grid case was achieved with one of the SSGs. For the largest plate-to-grid distance, the only grid producing an appreciable increase (by approximately 10%) of the heat transfer was one of the MIGs. The present results demonstrate that MIG design can be optimised to maximise the overall heat transfer from the plate. A MIG that produces a uniform transverse mean shear, which is approximat
AU  - Melina,G
AU  - Bruce,PJK
AU  - Nedi,J
AU  - Tavoularis,S
AU  - Vassilicos,C
DO  - 10.1016/j.ijheatmasstransfer.2018.03.019
EP  - 1086
PY  - 2018///
SN  - 0017-9310
SP  - 1068
TI  - Heat transfer from a flat plate in inhomogeneous regions of grid-generated turbulence
T2  - International Journal of Heat and Mass Transfer
UR  - http://dx.doi.org/10.1016/j.ijheatmasstransfer.2018.03.019
UR  - http://hdl.handle.net/10044/1/57939
VL  - 123
ER  -
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