Numerical investigation of compressibility effects on friction factor in rectangular microchannels

2022 ◽  
Vol 172 ◽  
pp. 107373
Author(s):  
P. Vocale ◽  
D. Rehman ◽  
G.L. Morini
Keyword(s):  
Friction Factor ◽  
Numerical Investigation ◽  
Rectangular Microchannels ◽  
Compressibility Effects

Numerical investigation of the bubble growth in horizontal rectangular microchannels

2017 ◽  
Vol 71 (12) ◽  
pp. 1175-1188 ◽  
Author(s):  
Yang Luo ◽  
Jingzhi Zhang ◽  
Wei Li ◽  
Ekaterina Sokolova ◽  
Yourong Li ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Bubble Growth ◽  
Rectangular Microchannels

Nonlinear Study of Convective Heat Transfer in Tightly Curved Rectangular Microchannels

2016 ◽  
Author(s):  
Fang Liu
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Steady State ◽  
Friction Factor ◽  
Flow Instability ◽  
Numerical Study ◽  
Chaotic Oscillation ◽  
Periodic Oscillation ◽  
Stable Steady State ◽  
Rectangular Microchannels

To address the effects of curvature, initial conditions and disturbances, a numerical study is made on the fully-developed bifurcation structure and stability of the forced convection in tightly curved rectangular microchannels of aspect ratio 10 and curvature ratio 0.5 at Prandtl number 7.0. Eleven solution branches (seven symmetric and four asymmetric) are found with 10 bifurcation points and 27 limit points. The flows on these branches are with 2, 4, 6, 7, 8, 9 or 10-cell structures. The flow structures change along the branch because of the flow instability. The average friction factor and Nusselt Number are different on different solution branches. It is found that more than 22.33% increase in Nu can be achieved with less than 9.34% increase in fRe at Dk of 2000. As Dean number increases, finite random disturbances lead the flows from a stable steady state to another stable steady state, a periodic oscillation, an intermittent oscillation, another periodic oscillation and a chaotic oscillation. The mean friction factor and mean Nusselt Number are obtained for all physically realizable flows. A significant enhancement of heat transfer can be obtained at the expense of a slightly increase of flow friction in tightly coiled rectangular ducts.

scholarly journals Numerical Investigation of Heat Transfer and Friction Factor Characteristics in a Circular Tube Fitted with V-Cut Twisted Tape Inserts

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Sami D. Salman ◽  
Abdul Amir H. Kadhum ◽  
Mohd S. Takriff ◽  
Abu Bakar Mohamad
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Numerical Investigation ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Twisted Tape ◽  
Maximum Heat ◽  
High Heat Transfer ◽  
Maximum Heat Transfer ◽  
Twist Ratio

Numerical investigation of the heat transfer and friction factor characteristics of a circular fitted with V-cut twisted tape (VCT) insert with twist ratio (y=2.93) and different cut depths (w=0.5, 1, and 1.5 cm) were studied for laminar flow using CFD package (FLUENT-6.3.26). The data obtained from plain tube were verified with the literature correlation to ensure the validation of simulation results. Classical twisted tape (CTT) with different twist ratios (y=2.93, 3.91, 4.89) were also studied for comparison. The results show that the enhancement of heat transfer rate induced by the classical and V-cut twisted tape inserts increases with the Reynolds number and decreases with twist ratio. The results also revealed that the V-cut twisted tape with twist ratioy=2.93and cut depthw=0.5 cm offered higher heat transfer rate with significant increases in friction factor than other tapes. In addition the results of V-cut twist tape compared with experimental and simulated data of right-left helical tape inserts (RLT), it is found that the V-cut twist tape offered better thermal contact between the surface and the fluid which ultimately leads to a high heat transfer coefficient. Consequently, 107% of maximum heat transfer was obtained by using this configuration.

Semi-local friction factor of turbulent gas flow through rectangular microchannels

2016 ◽  
Vol 98 ◽  
pp. 643-649 ◽  
Author(s):  
Chungpyo Hong ◽  
Taiki Nakamura ◽  
Yutaka Asako ◽  
Ichiro Ueno
Keyword(s):  
Friction Factor ◽  
Gas Flow ◽  
Rectangular Microchannels ◽  
Flow Through ◽  
Turbulent Gas Flow

Numerical investigation of mixed convection of nanofluid flow in oblique rectangular microchannels with nanofluid jet injection

2021 ◽  
Vol 136 (10) ◽  
Author(s):  
Masoud Fatholahi ◽  
Amirmasoud Anvari ◽  
Omid Ali Akbari ◽  
Farnaz Montazerifar ◽  
Hamidreza Ghaedamini ◽  
...  
Keyword(s):  
Mixed Convection ◽  
Numerical Investigation ◽  
Jet Injection ◽  
Nanofluid Flow ◽  
Rectangular Microchannels

Numerical investigation of heat transfer and friction factor characteristics from in-line cam shaped tube bank in crossflow

2017 ◽  
Vol 110 ◽  
pp. 521-538 ◽  
Author(s):  
Chidanand K. Mangrulkar ◽  
Ashwinkumar S. Dhoble ◽  
Amey R. Deshmukh ◽  
Sachin A. Mandavgane
Keyword(s):  
Heat Transfer ◽  
Friction Factor ◽  
Numerical Investigation ◽  
Tube Bank ◽  
Shaped Tube
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