EFFECT OF AIR BUBBLE INJECTION ON THE FLOW NEAR A ROTARY DEVICE

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NOURI NOUROUZ MOHAMMAD; SARRESHTEHDARI ALI

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Journal: Journal of Aerospace Mechanics Year:2008 | Volume:4 | Issue:2 (12) Page(s): 81-87

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Information Journal Paper

Title

EFFECT OF AIR BUBBLE INJECTION ON THE FLOW NEAR A ROTARY DEVICE

Author(s)

NOURI NOUROUZ MOHAMMAD | SARRESHTEHDARI ALI | Issue Writer Certificate

Keywords

SKIN FRICTION REDUCTIONQ3

MICROBUBBLEQ3

DRAG REDUCTIONQ2

Abstract

In the work, modification of wall shear stress due to air bubble injection on a rotary apparatus was experimentally investigated. In this device, water flow field causes a rotary motion of hub by shear forces. Injected air bubbles cross the near wall region of the hub surface and affect its rotary behavior (in constant water flow rates). Void fraction increase leads to decrease of rotational velocity provided by the flow shear stresses. In high-void fractions, the hub motion stops completely. The amount of SKIN FRICTION REDUCTION was estimated by measurement of hub rotational velocity. Rotational velocity decrease, due to bubble injection leads to the reduction of wall shear stress in all range of water flow rates. More than 90 percent of rotational velocity reduction was achieved in maximum void fraction.This result expresses the significant reduction of shear stress on the rotary hub. The considerable amount of SKIN FRICTION REDUCTION obtained in this special test case indicates the effectiveness of gas bubbles injection on SKIN FRICTION REDUCTION in some rotary parts for special applications.

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APA: Copy

NOURI, NOUROUZ MOHAMMAD, & SARRESHTEHDARI, ALI. (2008). EFFECT OF AIR BUBBLE INJECTION ON THE FLOW NEAR A ROTARY DEVICE. AEROSPACE MECHANICS JOURNAL, 4(2 (12)), 81-87. SID. https://sid.ir/paper/101874/en

Vancouver: Copy

NOURI NOUROUZ MOHAMMAD, SARRESHTEHDARI ALI. EFFECT OF AIR BUBBLE INJECTION ON THE FLOW NEAR A ROTARY DEVICE. AEROSPACE MECHANICS JOURNAL[Internet]. 2008;4(2 (12)):81-87. Available from: https://sid.ir/paper/101874/en

IEEE: Copy

NOUROUZ MOHAMMAD NOURI, and ALI SARRESHTEHDARI, “EFFECT OF AIR BUBBLE INJECTION ON THE FLOW NEAR A ROTARY DEVICE,” AEROSPACE MECHANICS JOURNAL, vol. 4, no. 2 (12), pp. 81–87, 2008, [Online]. Available: https://sid.ir/paper/101874/en

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