What is it about?

Drag reduction and heat transfer enhancement have always received great attention from the scientific community and industrial sectors striving to improve the efficiency of the mechanical system. Dimples are used as a passive flow control technique to control the flow structure over the surface, hence, drag and heat transfer performance. Dimples' design is not an easy mission with the presence of too many design parameters affecting their performance. This study is concerned with investigating the effect of one design parameter, the dimple size, at different Reynolds numbers.

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Why is it important?

Optimizing the mechanical systems' performance by reducing drag, enhancing heat transfer, and improving overall efficiency is essential to many stakeholders and vital sectors such as aviation, transportation, and power generation, where they can reduce fuel consumption and operating costs, increase the systems' lifespan, and save our planet from tons of CO2 emissions. From the scientific research point of view, it contributes to understanding the mechanism of how passive methods can be effective to optimize the system's performance and paves the way to create advanced and more efficient techniques in the same manner.


I was excited to write this article as well as the co-authors as we believe that the outcomes of this research will be helpful to many vital sectors and their capability to make a difference. Dimples' design is complex but their potential to optimize the mechanical systems' performance makes them a promising passive control technique that deserves to be thoroughly investigated to reach the optimal design. This article is part of an ongoing research project which from we expect to have more mesmerizing results that we are looking to share with you in the near future.

Mahmoud Nasr
National University of Singapore

Read the Original

This page is a summary of: The thermo-aerodynamic performance of turbulent channel flow over dimples of different sizes, Physics of Fluids, July 2023, American Institute of Physics,
DOI: 10.1063/5.0155806.
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