scholarly journals A Review on Analysis of Heat Transfer Coefficient in Internal Rib Tube

2021 ◽  
Vol 6 (12) ◽  
pp. 4
Author(s):  
Rahul Kumar
Keyword(s):  
Heat Transfer ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Vortex Chamber ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Flow Disturbances ◽  
Common Technique ◽  
Improve Heat Transfer ◽  
Save Energy

The rate of heat transfer is increased by a fin arrangement applied to the rectangular duct. In order to save energy, many industrial heat exchange devices use various techniques to improve heat transfer, such as: B. fins, dimples, vortex chamber and ribbed tabs. The most common technique used to improve heat transfer is to add fins to the flow channel. The ribs are of simple construction and are widely used in many industries. Turbulent kinetic energy generation increases turbulent heat transfer in the duct due to flow disturbances caused by fin arrangements. The shape of the fin plays an important role in improving heat transfer as it affects the formation of bubble separation behind the fin and the amount of turbulent kinetic energy generated.

Turbulent heat transfer at the forward face surface of a vortex chamber

1989 ◽  
Vol 56 (2) ◽  
pp. 109-115 ◽  
Author(s):  
�. P. Volchkov ◽  
S. V. Semenov ◽  
V. I. Terekhov
Keyword(s):  
Heat Transfer ◽  
Vortex Chamber ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Face Surface

Swirling Effects on Laminarization of Gas Flow in a Strongly Heated Tube

1999 ◽  
Vol 121 (2) ◽  
pp. 307-313 ◽  
Author(s):  
S. Torii ◽  
W.-J. Yang
Keyword(s):  
Heat Transfer ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Cross Section ◽  
Velocity Gradient ◽  
Gas Flow ◽  
Numerical Study ◽  
Substantial Reduction ◽  
Turbulent Heat ◽  
Tube Cross Section

A numerical study is performed to investigate thermal transport phenomena in a process of laminarization from a turbulent flow in a strongly heated circular tube in coaxial rotation. The k-ε turbulence and t2-εt, heat transfer models are employed to determine the turbulent viscosity and eddy diffusivity for heat, respectively. The governing boundary layer equations are discretized by means of a control-volume finite difference technique and numerically solved using a marching procedure. When the tube is at rest, it is disclosed that: (i) when laminarization occurs, the streamwise velocity gradient at the wall is diminished along the flow, resulting in a substantial reduction in the turbulent kinetic energy over the whole tube cross section, (ii) the attenuation causes a deterioration in heat transfer performance, and (iii) simultaneously, both the turbulent heat flux and temperature variance diminish over the whole tube cross section in the flow direction. However, the presence of tube rotation contributes to the promotion of laminarization of gas flow. The mechanism is that a reduction in the velocity gradient induced by tube rotation suppresses the production of turbulent kinetic energy, resulting in an amplification in laminarizing the flow process.

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