Thermophoresis and Brownian motion effects on heat transfer enhancement at film boiling of nanofluids over a vertical cylinder

2016 ◽  
Vol 216 ◽  
pp. 503-509 ◽  
Author(s):  
A. Malvandi ◽  
S. Heysiattalab ◽  
D.D. Ganji
Keyword(s):  
Heat Transfer ◽  
Brownian Motion ◽  
Heat Transfer Enhancement ◽  
Vertical Cylinder ◽  
Film Boiling ◽  
Transfer Enhancement ◽  
And Brownian Motion

Be´nard Instability of Nanofluids

2007 ◽  
Author(s):  
D. Y. Tzou ◽  
Emily J. Pfautsch
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Brownian Motion ◽  
Heat Transfer Enhancement ◽  
Critical Rayleigh Number ◽  
Critical Value ◽  
Characteristic Dimension ◽  
Turbulent Regime ◽  
Combined Effects ◽  
Transfer Enhancement

Be`nard instability in nanofluids is investigated in this work. With the combined effects of Brownian motion and thermophoresis of nanoparticles incorporated in natural convection, the critical Rayleigh number governing the transition from laminar to turbulent regime is shown to be 18.11, as compared to 1715.14 in regular fluids. The lower critical value, by as much as two orders of magnitude, reveals that there is heat transfer enhancement by turbulence. This effect is much more significant than the heat transfer enhancement by increased thermal conductivity alone. A nondimensional analysis is performed to extract the dominating parameters governing the turbulence enhancement. Their effects are illustrated along with the characteristic dimension of the Be`nard cells.

Heat Transfer Enhancement in Spirally Corrugated Tube

2014 ◽  
Vol 7 (6) ◽  
pp. 970 ◽  
Author(s):  
Tholudin Mat Lazim ◽  
Zaid Sattar Kareem ◽  
M. N. Mohd Jaafar ◽  
Shahrir Abdullah ◽  
Ammar F. Abdulwahid
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Transfer Enhancement ◽  
Corrugated Tube
Sign in / Sign up

Export Citation Format

Share Document