Measurements of gas and vapour bubble detachment frequency, diameter and rise velocity

• Autorzy: Szymczyk, J. A. , Cieśliński, J. T.
• Języki publikacji: EN

Abstrakty

EN

For single gas and vapour bubbles, the equivalent diameter, the rise velicity, and the frequency were measured on single artificial sites in distilled water. The air bubbles were emitted from glass nozzles with internal diameters of 0.3 mm, 0.6 mm, 0.9 mm and metallic orfice plates 2mm and 4 mm in diameter. Electrically heated needles have been employed to produce vapour bubbles. The needles made of brass and stainless steel were placed in glass tubes so a kind of pin fin were produced. The diameter of the pin fin at the base ranged from 0.27 mm to 0.78 mm and height from 0.48 to 4.8 mm. The experoments were conducted at atmospheric pressure. A technique based on Particle Image Velocimetry for measurement of bubble size and rise velocity has been developed and frequency of bubble departure was measured using a variable frequency stroboscope.

• Czasopismo: Transactions of the Institute of Fluid-Flow Machinery
• Rocznik: 2001
• Tom: nr 109
• Strony: 69-85
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Szymczyk, J. A.

• Department of Fluid Mechanics and Turbo Machines, Fachhochschule Stralsund (Univeristy of Applied Sciences), Stralsund, German,

autor

Cieśliński, J. T.

• Department of Heat Technology, Technical University of Gdańsk, Poland,

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