Thermal performance and flow behavior of winglets vortex generators in a circular tube
General Material Designation
[Thesis]
First Statement of Responsibility
Yunbo Xu
Subsequent Statement of Responsibility
Islam, Md Didarul; Khezzar, Lyes
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
The Petroleum Institute (United Arab Emirates)
Date of Publication, Distribution, etc.
2016
PHYSICAL DESCRIPTION
Specific Material Designation and Extent of Item
144
GENERAL NOTES
Text of Note
Committee members: Al Alili, Ali
NOTES PERTAINING TO PUBLICATION, DISTRIBUTION, ETC.
Text of Note
Place of publication: United States, Ann Arbor; ISBN=978-1-369-37469-8
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
M.S.
Discipline of degree
Mechanical Engineering
Body granting the degree
The Petroleum Institute (United Arab Emirates)
Text preceding or following the note
2016
SUMMARY OR ABSTRACT
Text of Note
Various technologies have been developed to enhance heat transfer and ultimately to develop more efficient compact heat exchanging devices. Vortex generators/turbulence promoters generate vortices which reduce boundary layer thickness and yield a better mixing of the fluid to enhance heat transfer. Vortex generators (VGs) create longitudinal vortices which do not decay until further downstream and consequently increase heat transfer coefficient with comparatively lower pressure drop in this region. In this research, thermal performance of winglets longitudinal VGs is investigated experimentally and numerically. Delta winglet VGs of different heights, attack angles and arrangements are inserted inside a pipe of inner diameter D = 52 mm. Research with and without VGs is conducted for air flow within a range of Reynolds numbers 6000 to 33000 and a constant heat flux of 694 W/m 2 on the tube surface. The influence of the winglet VGs on thermal performance and pressure dissipation is investigated through Nusselt number and friction factor.