Numerical simulation of turbulent airflow and heat transfer through a rectangular channel along with two trapezoidal baffle plates: Comparison between plane and trapezoidal shape baffles

2021 ◽  
Author(s):  
Sandip Saha
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Rectangular Channel ◽  
Trapezoidal Shape ◽  
Turbulent Airflow

Numerical Simulation of Nonlinear Flow and Heat Transfer in a Sudden Expansion and Contraction Channel

2016 ◽  
Author(s):  
M. Yang ◽  
L. Q. Yang ◽  
W. Lu ◽  
L. Li ◽  
Q. X. Liu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Rectangular Channel ◽  
Flow Region ◽  
Nonlinear Flow ◽  
Forced Flow ◽  
Sudden Expansion ◽  
Symmetric State ◽  
Flow And Heat Transfer

Numerical simulation of forced flow in sudden-expansion followed by sudden-contraction rectangular channel was presented for the whole flow region. The nonlinear flow and heat transfer characteristics were investigated by various Reynolds number and geometrical dimension and the critical Reynolds numbers under different conditions have been calculated. The results show flow and heat transfer from symmetric state to asymmetric state with the increase of Re. When Re<Rec (critical Reynolds number for flow transformation), the symmetric state is stable. On the other hand, when Re ≥Rec, the flow loses stability and from symmetric to asymmetric via a symmetry-breaking bifurcation. And the heat transfer performance have relevant characteristics as fluid flow.

scholarly journals Numerical Investigation of Water Film Evaporation with the Countercurrent Air in the Asymmetric Heating Rectangular Channel for Passive Containment Cooling System

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Kashuai Du ◽  
Po Hu ◽  
Zhen Hu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Cooling System ◽  
Rectangular Channel ◽  
Water Film ◽  
Annular Channel ◽  
Countercurrent Flow ◽  
Film Evaporation ◽  
Air Inlet ◽  
Asymmetric Heating

Passive containment cooling system (PCCS) is an important passive safety facility in the large advanced pressurized water reactor. Using the physical laws, such as gravity and buoyancy, the water film/air countercurrent flow is formed in the external annular channel to keep inside temperature and pressure below the maximum design values. Due to the large curvature radius of the annular channel, one of the short arc segments is taken out, as a rectangular channel, to analyze the main water film evaporation heat transfer characteristics. Two numerical methods are used to predict the water film evaporative mass flow rate during the heat transfer process in the large-scale rectangular channel with asymmetric heating when the water film temperature is not saturated. At the same time, these numerical simulation results are validated by the experiment which is set up to study water film/air countercurrent flow heat transfer on a vertical back heating plate with 5 m in length and 1.2 m in width. It is shown that the maximum deviation between numerical simulation and experiment is 30%. In addition, the influences on these parameters, such as heat flux, evaporative mass flow rate, and water film thickness, are evaluated under the different tilted angles of the rectangular channel and horizontal plane, water/air inlet flow rates, water/air inlet temperatures, heating surface temperatures, and air inlet relative humidities. All these results can provide a good guidance for the design of PCCS in the future.

The Characteristics of Heat Transfer and Flow on a Surface With Small Scale V-Shape Groove

2009 ◽  
Author(s):  
Jiansheng Wang ◽  
Zhiqin Yang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Coherent Structure ◽  
Rectangular Channel ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Local Heat Transfer Coefficient ◽  
Small Scale

The characteristics of heat transfer and flow in a rectangular channel with bottom of scale groove were investigated with numerical method. The numerical calculation was performed with large eddy simulation. A variety of small scale V-shapes groove with different of depth and space in longitudinal were employed in numerical simulation. The coherent structure near the surface of small scale groove was studied. The effect of the depth and space in longitudinal of small scale groove on coherent structure was investigated. Furthermore, the relationship between coherent structure and local heat transfer coefficient was investigated as well as. The numerical results indicate that the heat transfer performance of channel with small scale groove has been improved and the drag reduction has been gained in some case. The numerical simulation indicated that flow structure in different area of small scale groove had obvious difference and it would cause influence on local heat transfer coefficient.

scholarly journals Numerical simulation of flow dynamics and heat transfer in a rectangular channel with periodic ribs on one of the walls

2021 ◽  
Vol 2119 (1) ◽  
pp. 012028
Author(s):  
A V Barsukov ◽  
V V Terekhov ◽  
V I Terekhov
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Reynolds Number ◽  
Turbulent Flow ◽  
Turbulence Model ◽  
Rectangular Channel ◽  
Flow Dynamics ◽  
Flat Channel ◽  
Optimal Model

Abstract The result of numerical simulation of a turbulent flow in a flat channel with a periodic transverse rib by the RANS and LES methods is presented. The Reynolds number, calculated from the rib height and the superficial velocity, is Re = 12600. The data obtained as a result of the study demonstrate the influence of the modeling method and the turbulence model on the quality of heat transfer prediction. The optimal model for this type of problems is presented.

Enhancement of Heat Transfer in a Short Rectangular Channel with Substantial Deflection of Inlet Velocity from Axial Direction

2005 ◽  
Vol 36 (4) ◽  
pp. 311-318 ◽  
Author(s):  
R. Bunker ◽  
M. YA. Belen'kii ◽  
M. A. Gotovskii ◽  
B. S. Fokin ◽  
S. A. Isaev
Keyword(s):  
Heat Transfer ◽  
Rectangular Channel ◽  
Axial Direction ◽  
Enhancement Of Heat Transfer ◽  
Inlet Velocity
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