THE EXPERIMENTAL STUDY OF THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE TRANSITION OF THE BOUNDARY LAYER

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JAHANMIRI M.; HATAMI A.

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Seminar Paper

Paper Information

Seminar: CONFERENCE ON RECENT RESEARCH IN SCIENCE AND TECHNOLOGY
Year:2018 | Issue:14

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Title

THE EXPERIMENTAL STUDY OF THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE TRANSITION OF THE BOUNDARY LAYER

Author(s)

JAHANMIRI M. | HATAMI A.

Keywords

DISCRETE ROUGHNESS ELEMENTS

BOUNDARY LAYER TRANSITION

VELOCITY PROFILE

Abstract

MANY ATTEMPTS HAVE BEEN DONE TO DELAY THE TRANSITION PROCESS OF BOUNDARY LAYER FLOW. IN THIS STUDY, THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE DELAY OF THE TRANSITION OF THE BOUNDARY LAYER ON A FLAT PLATE IS INVESTIGATED EMPIRICALLY. IF THE HEIGHT OF THE DISCRETE ROUGHNESS ELEMENTS IS LESS THAN HALF OF THE THICKNESS OF THE BOUNDARY LAYER AT THE INSTALLATION SITE; THE TRANSITION FROM THE LAMINAR TO THE TURBULENT REGIME IS DELAYED. IN THE PRESENT WORK, HEMISPHERE ROUGHNESS ELEMENTS WERE PLACED ON A FLAT PLATE TO EXAMINE THEIR EFFECT ON DELAYING THE TRANSITION PROCESS. EXPERIMENTS WERE CARRIED OUT AT A SPEED OF 4.5 M / S AND AT TWO DISTANCES OF 45.8 AND 58.5 CM FROM THE LEADING EDGE OF THE FLAT PLATE IN THE WIND TUNNEL OF SHIRAZ UNIVERSITY OF TECHNOLOGY. THE MEASUREMENTS WERE CARRIED OUT ONCE WITHOUT ELEMENTS AND AGAIN BY PLACING THE ELEMENTS ON A FLAT PLATE. THESE ELEMENTS ARE PLACED IN A ROW ON THE SCREEN. BASED ON THE RESULTS, WITH THE PRESENCE OF ELEMENTS, THE SLOPE OF THE PROFILE IS SLOWER, INDICATING THE DELAY OF THE BOUNDARY LAYER TRANSITION.

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APA: Copy

JAHANMIRI, M., & HATAMI, A.. (2018). THE EXPERIMENTAL STUDY OF THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE TRANSITION OF THE BOUNDARY LAYER. CONFERENCE ON RECENT RESEARCH IN SCIENCE AND TECHNOLOGY. SID. https://sid.ir/paper/948946/en

Vancouver: Copy

JAHANMIRI M., HATAMI A.. THE EXPERIMENTAL STUDY OF THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE TRANSITION OF THE BOUNDARY LAYER. 2018. Available from: https://sid.ir/paper/948946/en

IEEE: Copy

M. JAHANMIRI, and A. HATAMI, “THE EXPERIMENTAL STUDY OF THE EFFECT OF DISCRETE ROUGHNESS ELEMENTS ON THE TRANSITION OF THE BOUNDARY LAYER,” presented at the CONFERENCE ON RECENT RESEARCH IN SCIENCE AND TECHNOLOGY. 2018, [Online]. Available: https://sid.ir/paper/948946/en

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