Natural Convection Flow over Wavy Horizontal Surface

Siddiqa, Sadia; Hossain, Md. Anwar

doi:10.1155/2013/743034

Cited by 13 publications

(4 citation statements)

References 17 publications

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“…Tiny obstacles can be made larger resulting in wavy, undulating surfaces. A numerical boundary layer analysis is performed over a heated horizontal wavy surface, 30 where it was concluded that surface geometry (undulations) plays a vital role in controlling heat transfer rate. Similarly, in Raayai-Ardakani and McKinley, 31 the effects of periodic sinusoidal riblet surfaces aligned in the flow direction (also known as a ''wrinkled'' texture) on the evolution of a laminar boundary layer flow are explored.…”

Section: Passive Flow Controlmentioning

confidence: 99%

Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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Successful flow control may bring numerous benefits, such as flow stabilization, flow reattachment, separation delay, drag reduction, lift increase, aerodynamic performance improvement, energy efficiency increase, shock delay or weakening, noise reduction, etc. For these purposes, many different flow control devices, which can be classified as passive, semi-active and active, have been designed and tested. This review paper aims to highlight the most promising and commonly employed boundary layer control methods as well as outline their potential in specific applications in aerospace and energy engineering. Referenced studies, performed on various geometries (flat plates, channels, airfoils, wings, blades, cylinders), are primarily numerical or experimental. Although enhanced aerodynamic performance is achieved in many cases, further research is required to draw general conclusions. This paper aims to demonstrate that, in the future, we may expect further developments of flow control actuators, as well as their increased application.

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Section: Passive Flow Controlmentioning

confidence: 99%

Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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“…The use of surface waviness to increase the natural convective heat transfer from horizontal surfaces has been quite extensively investigated in the past, e.g., see [1][2][3][4][5][6][7], and the use of waves with a triangular crosssectional shape in this configuration has received quite significant attention. However, the results of the studies of the use of triangular shaped waves indicate that under some conditions such a wave shape does not produce as great an increase in the heat transfer rate as would be anticipated.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Study of the Effect of Spaced Triangular Surface Waves on Natural Convective Heat Transfer From an Upward Facing Heated Horizontal Isothermal Surface

Oosthuizen

Kalendar

2020

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)

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The use of surface waviness to increase the natural convective heat transfer rate from horizontal surfaces has been extensively investigated and the use of waves with a triangular cross-sectional shape has received significant attention. These studies of the use of triangular shaped waves indicated that the waves do not always produce as significant an increase in the heat transfer rate as anticipated. Most existing studies of the effect of triangular surface waves on the heat transfer rate considered arrangements involving continuous waves, i.e., each wave started where the preceding wave ended However, it may be possible that triangular surface waves would be more effective in increasing the heat transfer rate if they were spaced, i.e., if there was a flat section between each pair of waves. This has been numerically investigated in the present study. Natural convective heat transfer from a horizontal upward facing isothermal heated surface imbedded in a surrounding adiabatic surface has been considered. The heated surface was covered with a series of parallel triangular surface waves running longitudinally along the surface with a space between each pair of waves. Conditions under which laminar, transitional, and turbulent flows exist have been considered. The solution has been obtained using ANSYS FLUENT ©. Results have been obtained for a Prandtl number of 0.74. The results indicate that using spaced waves produces a higher heat transfer rate than exists with non-spaced waves.

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“…Siddiqa and Hossain [21] analyzed convective flow. Siddiqa et al [22] illustrated free convective flow past radiative wavy surface.…”

Section: Introductionmentioning

confidence: 99%