Bubble induced flow field modulation for pool boiling enhancement over a tubular surface

2017 ◽  
Vol 110 (25) ◽  
pp. 251603 ◽  
Author(s):  
P. A. Raghupathi ◽  
I. M. Joshi ◽  
A. Jaikumar ◽  
T. S. Emery ◽  
S. G. Kandlikar
Keyword(s):  
Flow Field ◽  
Pool Boiling ◽  
Boiling Enhancement ◽  
Tubular Surface ◽  
Induced Flow ◽  
Field Modulation

ALUMINUM FOAMS FOR WATER POOL BOILING ENHANCEMENT

2018 ◽  
Author(s):  
Luca Doretti ◽  
Hossein Sadafi ◽  
Giulia Righetti ◽  
Kamel Hooman ◽  
Giovanni Antonio Longo ◽  
...  
Keyword(s):  
Pool Boiling ◽  
Water Pool ◽  
Aluminum Foams ◽  
Boiling Enhancement

Lower Limit of the Possible Nucleate Pool-Boiling Enhancement by Surfactant Addition to Water

2002 ◽  
Vol 9 (3-4) ◽  
pp. 153-160 ◽  
Author(s):  
Yu-Min Yang ◽  
Chao-Yang Lin ◽  
Ming-Huei Liu ◽  
Jer-Ru Maa
Keyword(s):  
Lower Limit ◽  
Pool Boiling ◽  
Nucleate Pool Boiling ◽  
Boiling Enhancement

Scale effects of graphene and graphene oxide coatings on pool boiling enhancement mechanisms

2017 ◽  
Vol 109 ◽  
pp. 357-366 ◽  
Author(s):  
Arvind Jaikumar ◽  
Anju Gupta ◽  
Satish G. Kandlikar ◽  
Chien-Yuh Yang ◽  
Ching-Yuan Su
Keyword(s):  
Graphene Oxide ◽  
Scale Effects ◽  
Pool Boiling ◽  
Oxide Coatings ◽  
Boiling Enhancement

Thermally Induced Flow in a Rotating Annulus Filled With a Compressible Fluid

1988 ◽  
Vol 110 (2) ◽  
pp. 134-139 ◽  
Author(s):  
M. A. Ortega ◽  
J. T. Sielawa
Keyword(s):  
Flow Field ◽  
Inner Core ◽  
Temperature Fields ◽  
Bottom Plate ◽  
Rossby Number ◽  
Thermally Induced ◽  
Coaxial Cylinders ◽  
Induced Flow ◽  
Velocity And Temperature Fields ◽  
Induced Velocity

The thermally induced flow field, in a rapidly rotating container consisting of a pair of coaxial cylinders bounded on the top and bottom by horizontal end plates, is considered. The top plate is heated and the bottom plate is cooled, both by small amounts, so that the thermal Rossby number is small, and the cylinders are supposed to be conductive. The induced velocity and temperature fields are determined by subdivision of the flow field; the equation for the central part, the inner core, is solved numerically as well as analytically.

scholarly journals Numerical and Experimental Analyses of Three- Dimensional Unsteady Flow around a Micro-Pillar Subjected to Rotational Vibration

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 668 ◽  
Author(s):  
Kanji Kaneko ◽  
Takayuki Osawa ◽  
Yukinori Kametani ◽  
Takeshi Hayakawa ◽  
Yosuke Hasegawa ◽  
...  
Keyword(s):  
Flow Field ◽  
Moving Boundary ◽  
Three Dimensional ◽  
Steady Streaming ◽  
Micro Piv ◽  
Piv Measurement ◽  
Image Velocimetry ◽  
Measurement Tools ◽  
Rotational Vibration ◽  
Induced Flow

The steady streaming (SS) phenomenon is gaining increased attention in the microfluidics community, because it can generate net mass flow from zero-mean vibration. We developed numerical simulation and experimental measurement tools to analyze this vibration-induced flow, which has been challenging due to its unsteady nature. The validity of these analysis methods is confirmed by comparing the three-dimensional (3D) flow field and the resulting particle trajectories induced around a cylindrical micro-pillar under circular vibration. In the numerical modeling, we directly solved the flow in the Lagrangian frame so that the substrate with a micro-pillar becomes stationary, and the results were converted to a stationary Eulerian frame to compare with the experimental results. The present approach enables us to avoid the introduction of a moving boundary or infinitesimal perturbation approximation. The flow field obtained by the micron-resolution particle image velocimetry (micro-PIV) measurement supported the three-dimensionality observed in the numerical results, which could be important for controlling the mass transport and manipulating particulate objects in microfluidic systems.

Pool-boiling enhancement using multilevel modulated wick

2018 ◽  
Vol 137 ◽  
pp. 268-276 ◽  
Author(s):  
Yahya Nasersharifi ◽  
Massoud Kaviany ◽  
Gisuk Hwang
Keyword(s):  
Pool Boiling ◽  
Boiling Enhancement

A Numerical Approach in Predicting Flow Field Induced by Randomly Moving Nano Particles

2013 ◽  
Author(s):  
Way Lee Cheng ◽  
Reza Sadr
Keyword(s):  
Flow Field ◽  
Underlying Mechanism ◽  
Numerical Approach ◽  
Small Time ◽  
Nano Particles ◽  
Navier Stokes ◽  
Time Step ◽  
Navier Stokes Equation ◽  
Brownian Particles ◽  
Induced Flow

There have been several reports that suspending nano-particles in a fluid, or nanofluids, can enhance heat transfer properties such as conductivity. However, the extend of the reported enhancement is inconsistent in the literature and the exact mechanisms that govern these observations (or phenomena) are not fully understood. Although the interaction between the fluid and suspended particles is suspected to be the main contributor to this phenomenon, literature shows contradicting conclusions in the underlying mechanism responsible for these effects. This highlights the need for development of computational tools in this area. In this study, a computational approach is developed for simulating the induced flow field by randomly moving particles suspended in a quiescent fluid. Brownian displacement is used to describe the random walk of the particles in the fluid. The steady state movement is described with simplified Navier-Stokes equation to solve for the induced fluid flow around the moving particles with constant velocity at small time steps. The unsteady behavior of the induced flow field is approximated using the velocity profiles obtained from FLUENT. Initial results show that random movements of Brownian particles suspended in the fluid induce a random flow disturbance in the flow field. It is observed that the flow statistics converge asymptotically as time-step reduces. Moreover, inclusion of the transitional movement of the particles significantly affects the results.

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