RETRACTED: Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios
International Journal of Numerical Methods for Heat & Fluid Flow
ISSN: 0961-5539
Article publication date: 24 October 2018
Issue publication date: 10 June 2019
Retraction statement
The publishers of International Journal of Numerical Methods for Heat & Fluid Flow wish to retract the article Bakhshi, H., Khodabandeh, E., Akbari, O., Toghraie, D., Joshaghani, M. and Rahbari, A. (2019), “Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios”, International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 5, pp. 1680-1698. https://doi.org/10.1108/HFF-05-2018-0231
An internal investigation into a series of submissions has uncovered evidence that the peer review process was compromised. As a result of these concerns, the findings of the article cannot be relied upon. This decision has been taken in accordance with Emerald's publishing ethics and the COPE guidelines on retractions.
The authors of this paper would like to note that they do not agree with the content of this notice.
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Abstract
Purpose
In the present study, laminar steady flow of nanofluid through a trapezoidal channel is studied by using of finite volume method. The main aim of this paper is to study the effect of changes in geometric parameters, including internal and external dimensions on the behavior of heat transfer and fluid flow. For each parameter, an optimum ratio will be presented.
Design/methodology/approach
The results showed that in a channel cell, changing any geometric parameter may affect the temperature and flow field, even though the volume of the channel is kept constant. For a relatively small hydraulic diameter, microchannels with different angles have a similar dimensionless heat flux, while channels with bigger dimensions show various values of dimensionless heat flux. By increasing the angles of trapezoidal microchannels, dimensionless heat flux per unit of volume increases. As a result, the maximum and minimum heat transfer rate occurs in a trapezoidal microchannel with 75° and 30 internal’s, respectively. In the study of dimensionless heat flux rate with hydraulic diameter variations, an optimum hydraulic diameter (Dh) was observed in which the heat transfer rate per unit volume attains maximum value.
Findings
This optimum state is predicted to happen at a side angle of 75° and hydraulic diameter of 290 µm. In addition, in trapezoidal microchannel with higher aspect ratio, dimensionless heat flux rate is lower. Changing side angles of the channels and pressure drop have the same effect on pressure drop. For a constant pressure drop, if changing the side angles causes an increase in the rectangular area of the channel cross-section and the effect of the sides are not felt by the fluid, then the dimensionless heat flux will increase. By increasing the internal aspect ratio (t_2/t_3), the amount of t_3 decreases, and consequently, the conduction resistance of the hot surface decreases.
Originality/value
The effects of geometry of the microchannel, including internal and external dimensions on the behavior of heat transfer and fluid flow for pressure ranges between 2 and 8 kPa.
Keywords
Citation
Bakhshi, H., Khodabandeh, E., Akbari, O., Toghraie, D., Joshaghani, M. and Rahbari, A. (2019), "RETRACTED: Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 29 No. 5, pp. 1680-1698. https://doi.org/10.1108/HFF-05-2018-0231
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited