A numerical investigation of turbulent convective heat transfer of supercritical CO2 in vertical mini tubes Online publication date: Thu, 31-Jul-2014
by Zhenghua Rao; Shengming Liao
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 14, No. 3, 2014
Abstract: This article presents a numerical investigation on the turbulent convective heat transfer of supercritical CO2 in vertical mini tubes. For buoyancy-aided cases, buoyancy-opposed cases and buoyancy-free cases, the profiles of velocity, temperature and turbulent kinetic energy, as well as heat transfer coefficients and Nusselt numbers inside the tubes with the diameters less than 2 mm, under heating and cooling conditions, are obtained. It is found that the buoyancy is significant near the pseudocritical point due to the sharply varied properties of supercritical CO2, leading to the variations of the flow pattern, turbulent production and hence heat transfer coefficient in the tube. Detailed explanations to the physics of the complex but interesting transport phenomena are given. Furthermore, the values of the buoyancy parameter Grb/Reb 2.7 are calculated, and Jackson and Hall's criterion for assessing the buoyancy's influence is examined for cooling flows in mini tubes.
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.Complimentary Subscribers, Editors or Members of the Editorial Board of the Progress in Computational Fluid Dynamics, An International Journal (PCFD):
Login with your Inderscience username and password:
Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.
If you still need assistance, please email subs@inderscience.com