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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

DNS STUDY ON HEAT TRANSFER OF VISCOELASTIC FORCED HOMOGENEOUS ISOTROPIC TURBULENT FLOWS

Wenhua Zhang
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum (Beijing), Beijing 102249, China

Bo Yu
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

Jinjia Wei
School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, P.R. China; Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong Uniersity, Xi'an, 710049, P.R.China

Dongliang Sun
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Abstract

In order to have an insight into turbulent heat transfer reduction (HTR) mechanism by additives, quasi-steady heat transfer phenomena driven by a uniform temperature gradient were simulated based on direct numerical simulations (DNS) of viscoelastic forced homogeneous isotropic turbulent flows for the first time. Heat transfer characteristics were explored from statistic viewpoint. It was found that viscoelastic additives depress thermal fluctuations and turbulent heat flux, decrease heat transfer efficiency, increase intermittency of thermal fluctuations and make thermal fluctuations more orderly. Heat transfer reduction mechanism was deeply investigated from multi-scale viewpoint. It was concluded that viscoelastic additives modify turbulent structures and propel turbulent fluctuation to transfer heat against temperature gradient, which causes the heat transfer reduction phenomenon.

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