The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS
Transactions ID Number: 29-310
Full Name: K.Y. Kung
Position: Professor
Age: ON
Sex: Male
Address: NO.414, Sec.3, Jhongshan E. Rd., Jhongli, TAIWAN
Country: TAIWAN
Tel: 886-3-4361070-6210
Tel prefix: 886
Fax:
E-mail address: ky.kung@msa.hinet.net
Other E-mails: kykoung@nanya.edu.tw
Title of the Paper: The Gas-assisted Expelled Fluid Flow in the Front of a Long Bubble in a Channel
Authors as they appear in the Paper: C.H. Hsu, P.C. Chen , K.Y. Kung, and G.C. Kuo
Email addresses of all the authors:
Number of paper pages: 10
Abstract: Investigated in this study is the steady-state flow field of a long bubble penetrating into a region filled with a viscous fluid confined by two closely located parallel plates. Instead of using the complicated procedure for iteratively computing the free surface and flow patterns, we simply use a theoretical profile of the bubble so that the influence of bubble shape on the flow field can be examined directly. Due to the simplification, flow fields with higher Reynolds number are easier to be included and different flow phenomenon is found. The numerical techniques employed are finite difference method (FDM) with successive over-relaxation (SOR). The simulation results show coincidently with others the two typical flow patterns (complete bypass flow and recirculation flow). The gradually moving of the stagnation point in the front of the bubble tip between two typical flow patterns is clearly presented and explainable. Both of the position of the stagnation !
point parallel and perpendicular to the flow, and , depends on Reynolds number, Re, and , the ratio of asymptotic bubble width to the distance between two parallel plates. As or Re increases, increases too, but decreases. A quasi-linear relationship between and is found in a recirculation flow region. Be ware that the stagnation point is very sensitive with for Re>100. As Re increases, the maximum value of stream function increases, and the recirculation zone near the bubble tip becomes bigger too.
Keywords: long bubble, expelled fluid flow, stagnation point, two-phase flow, inertia forces.
EXTENSION of the file: .pdf
Special (Invited) Session: The Inertial Effects on the Flow Pattern in a Gas-assisted Injection Molding Process
Organizer of the Session: 613-274
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