Numerical Study of Laminar Flow and Heat Transfer Characteristic in Wave Tubes Based on Sine Curve

2011 ◽  
Vol 322 ◽  
pp. 349-352
Author(s):  
Zheng Ming Tong ◽  
Kai Zhu ◽  
Jia Lei Lu ◽  
Gen Li
Keyword(s):  
Heat Transfer ◽  
Flow Resistance ◽  
Numerical Study ◽  
Transfer Characteristic ◽  
Flow State ◽  
Field Synergy Principle ◽  
Corrugated Tube ◽  
Flow And Heat Transfer ◽  
New Type ◽  
Computational Fluid Dynamics Cfd

A new type of corrugated tube based on sine function is proposed by introducing a parameter of sine camber in this paper. Computational Fluid Dynamics (CFD) was used to analysis flow state and sine camber of tube influence on the heat transfer and flow. The heat transfer and flow around sinusoidal corrugated tubes with different sine camber e are investigated. According to the numerical calculus result, correlation equations of Nu (Nusselt) =f(Re) is given. At last, the theoretical comparative analysis with field synergy principle is carried out for the heat transfer and flow resistance in smooth tube and sinusoidal corrugated tube.

Convective Heat Transfer Characteristics of Laminar Flow in Sinusoidal Corrugated Tube

2011 ◽  
Vol 236-238 ◽  
pp. 1277-1282
Author(s):  
Zheng Ming Tong ◽  
Kai Zhu ◽  
Yong Hai Hu ◽  
Li Ye ◽  
Jia Lei Lu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Flow Resistance ◽  
Resistance Coefficient ◽  
Smooth Tube ◽  
Great Decrease ◽  
Flow State ◽  
Field Synergy ◽  
Corrugated Tube ◽  
New Type

A new type of corrugated tube based on sine function is proposed by introducing a parameter of sine camber. The heat transfer and flow around sinusoidal corrugated tubes with different sine camber e are investigated in this paper. Computational Fluid Dynamics (CFD) was used to analysis flow state and sine camber of tube influence on the heat transfer and flow, a correlation equations of Nu (Nusselt) =f(Re) is given. At last, the theoretical comparative analysis with field synergy principle is carried out for the heat transfer and flow resistance in smooth tube and sinusoidal corrugated tube. The results show that the experiment basically tallies with the value of numerical calculation of laminar flow. In the range of 500 < Re < 1000, flow resistance coefficient has great decrease extent, while low resistance coefficient has small decrease extent of 1500 < Re < 2300. The effect of field synergy is poor in the smooth tube, which is opposite to that in sinusoidal corrugated tube, and it can improve the efficiency of around 2.7 times.

Numerical Analysis of Blockage and Optimization of Heat Transfer Performance of Fractal-like Microchannel Nets

2005 ◽  
Vol 128 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Xiang-Qi Wang ◽  
Arun S. Mujumdar ◽  
Christopher Yap
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Flow Resistance ◽  
Heat Transfer Performance ◽  
Three Dimensional ◽  
Constant Heat Flux ◽  
Low Flow ◽  
Flow And Heat Transfer ◽  
Computational Fluid Dynamics Cfd ◽  
Number Of Branches

The conjugate fluid flow and heat transfer characteristics of fractal-like microchannel nets embedded in a disk-shape heat sink are investigated using a three-dimensional computational fluid dynamics (CFD) approach. A constant heat flux is applied to the top wall of the heat sink. The intrinsic advantages of fractal-like microchannel nets such as low flow resistance, temperature uniformity, and reduced danger of blockage compared with the traditional parallel channel nets are demonstrated. In addition, various optimized designs with parameters such as the number of branches, number of branching levels, and number of channels that reach the center of the disk are addressed in this context.

A Numerical Study of the Flow and Heat Transfer Characteristics of Outward Convex Corrugated Tubes With Twisted-Tape Insert

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Longbin Yang ◽  
Huaizhi Han ◽  
Yanjun Li ◽  
Xiaoming Li
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Performance ◽  
Swirling Flow ◽  
Numerical Study ◽  
Twisted Tape ◽  
Transfer Performance ◽  
Heat Transfer Characteristics ◽  
Corrugated Tube ◽  
Flow And Heat Transfer ◽  
Flow Heat

This work presents a mathematical model for simulating the swirling flow in an outward convex corrugated tube with twisted-tape insert (CT). The synergistic effect on the flow, heat transfer, and friction loss behaviors between the surface-based and fluid-based enhancements is numerically investigated. Renormalized group (RNG) k-ε turbulence model applied in our paper is verified by comparing with experimental results investigated by Manglik and Bergles. Comparisons of the CT and smooth tube with twisted-tape insert (ST) plots are confirmed to investigate the performance differences between them. When comparing the performance of the CT against the ST, the maximum ratio of Nusselt number (Nuc/Nus), ratio of friction factor (f/fs), and overall heat transfer performance (η) values realized in the CT are 1.36, 1.53, and 1.15 times higher, respectively, than the maximum values for those same variables in the ST.

scholarly journals Numerical study on the influencing mechanism of twisted ratio in outward convex corrugated tubes with a twisted tape insert

2018 ◽  
Vol 22 (Suppl. 2) ◽  
pp. 577-584
Author(s):  
Huaizhi Han ◽  
Longbin Yang ◽  
Yiran Hu ◽  
Ruitian Yu ◽  
Qun Zhang
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Numerical Study ◽  
Twisted Tape ◽  
High Twist ◽  
Numerical Investigations ◽  
Corrugated Tube ◽  
Influencing Mechanism ◽  
Flow And Heat Transfer ◽  
Twist Ratio

Numerical investigations were conducted on flow and heat transfer in an outward convex corrugated tube with various structural twisted tape inserts. The study investigated the influence of twisted ratio on thermodynamic regulation and mechanism in the corrugated tube. The results indicate that Nusselt number in the corrugated tube (Nuc) exceeds those in the corrugated tube and smooth tube by 120-136% and 171-317%, respectively. Meanwhile, the friction factor increases by 148-153% and 476-514%, respectively. The best overall thermal performance (h = 1.97) is obtained with a high twist ratio (y/w = 5). However, the highest thermal performance (Nuc/Nus = 4.78) is obtained with the lowest twist ratio (y/w = 1.25).

Flow and Heat Transfer Characteristics of Urban Original Sewage

2012 ◽  
Vol 461 ◽  
pp. 44-47
Author(s):  
Cheng Hu Zhang ◽  
Qing Ting Du ◽  
De Xing Sun
Keyword(s):  
Heat Transfer ◽  
Rheological Property ◽  
Heat Transfer Characteristic ◽  
Flow Resistance ◽  
Physical Property ◽  
Transfer Characteristic ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer

This paper introduces rheological property, thermo physical property, flow resistance and heat transfer characteristic of urban original sewage and the calculation thinking and method.

A Parametric Numerical Study of Fluid Flow and Heat Transfer in a Computer Chassis

2015 ◽  
Vol 9 (3) ◽  
pp. 242 ◽  
Author(s):  
Efstathios Kaloudis ◽  
Dimitris Siachos ◽  
Konstantinos Stefanos Nikas
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Study ◽  
Flow And Heat Transfer
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