Bo ZHOU
Professor Supervisor of Doctorate Candidates Supervisor of Master's Candidates
Title : Deputy Director of Graduate School Academic Office
Gender:Male
Alma Mater:Dalian University of Technology
Degree:Doctoral Degree
School/Department:School of Naval Architecture
Discipline:Design and Manufacture of Ship and Ocean Structure
Business Address:School of Naval Architecture, Room 105
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Date:2019-03-11
Indexed by:Journal Article
Date of Publication:2017-12-01
Journal:INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Included Journals:SCIE
Volume:68
Page Number:189-202
ISSN:0142-727X
Key Words:Curved duct; Dean instability; Dean vortices; Secondary flow
Abstract:The pressure driven, fully developed turbulent flow of incompressible viscous fluid (water) in 120 curved ducts of rectangular cross-section is investigated experimentally and numerically. Three different types of curved duct (A-CL, B-SL and C-IL) with continuously varying curvature conform to blade profile as the inner and outer curvature walls to simplify and guide the impeller design of pumps. After validating the numerical method against Particle Image Velocimetry (PIV) measurements, the flow development in the ducts is analyzed in detail by Computational Fluid Dynamics (CFD) for a wide range of Reynolds numbers (Re = 2.4 x 10(4)-1.4 x 10(5)) and aspect ratios (Ar > 1.0, =1.0 and <1.0). The results clearly depict the existence of multiple Dean vortices along the duct: while the axial velocity profile is more related to an inner Dean vortex (called split base vortex), the wall pressure is more influenced by the Dean vortex attached to the inner curvature wall (called ICW Dean vortex). The induced multiple Dean vortices and the secondary flow patterns in the duct cannot be faithfully predicted by using traditional techniques. Therefore, a new criterion based on the vortex core velocities is proposed. With this approach, the effects of Re, Cr and Ar on the Dean instabilities in curved ducts are carefully studied. Decreasing Re promotes the generation of Dean vortices closer to the duct inlet, a trend that is as opposed to laminar flow. In addition, a new pair of vortices called entrainment Dean vortex occurs near the outlet of the curved duct with Ar = 1.0, which has not been previously reported in the literature.
Dr Bo Zhou, Professor of Dalian University of Technology (DUT), doctoral supervisor, Liaoning Province "Xingliao elite plan" top young talents, DUT "Xinghai 1000 youth talents" plan.
Prior to joining DUT, he spent nearly 8 years at Singapore Nanyang Technological University in the School of Civil and Environmental Engineering from 2009. He worked on several research projects, such as the National Research Foundation project “Underwater Infrastructure and Underwater City of the Future”.
Dr Zhou specializes in Naval Architecture & Marine Engineering. He published more than 70 academic papers, and won 2 second prizes of the Liaoning Science and Technology Progress Award, 1 second prize of CSNAME Science and Technology Progress Award.
