scholarly journals Fluid flow and heat transfer within ducts of a cross-shaped cross-section. 3rd report Measurements of turbulent flow field and examination of the data.

1987 ◽  
Vol 53 (489) ◽  
pp. 1573-1579 ◽  
Author(s):  
Akira NAKAYAMA ◽  
Hitoshi KOYAMA ◽  
Takahiko WATANABE
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Flow Field ◽  
Turbulent Flow ◽  
Cross Section ◽  
Flow And Heat Transfer ◽  
Turbulent Flow Field ◽  
Shaped Cross Section

Effects of a flow mode transition on natural convection heat transfer in a heat tracing enclosure

2018 ◽  
Vol 233 (3) ◽  
pp. 489-499 ◽  
Author(s):  
CJ Ho ◽  
GN Sou ◽  
CM Lai
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Flow Field ◽  
Numerical Study ◽  
Flow Direction ◽  
Convection Heat Transfer ◽  
Flow Mode ◽  
Mode Transition ◽  
Flow And Heat Transfer ◽  
Lower Variation

This paper presents a numerical study of transient buoyancy-induced fluid flow and heat transfer between two horizontal, differentially heated pipelines inside a circular, air-filled enclosure. Numerical simulations based on the finite difference method were conducted to investigate the flow mode transition of the buoyant airflow and its effects on the heat transfer characteristics of the pipelines. The results indicate that the fluid flow complexity and the heat transfer of air between the pipelines are strongly affected by the Rayleigh number. When Ra = 6 × 105 and 1.2 × 106, both the flow field and the temperature distribution exhibit periodic variations with different patterns. The former ( Ra = 6 × 105) is a complete alteration of the flow direction from clockwise to counterclockwise, whereas the latter is a variation in the flow field strength that varies between strong and weak. The latter has a lower variation frequency than that of the former.

scholarly journals Experimental Study and Conjugate Heat Transfer Simulation of Turbulent Flow in a 90° Curved Square Pipe

Energies ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 94
Author(s):  
Guanming Guo ◽  
Masaya Kamigaki ◽  
Qiwei Zhang ◽  
Yuuya Inoue ◽  
Keiya Nishida ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Turbulent Flow ◽  
Cross Section ◽  
Conjugate Heat Transfer ◽  
Air Flow ◽  
Temperature Fields ◽  
Spatial Average ◽  
Flow And Heat Transfer ◽  
Curved Pipes

This paper discusses the turbulent flow and heat transfer from a uniform air flow with high temperature to the outside through a 90° curved square pipe. Both conjugate heat transfer (CHT) simulation and experiments of temperature field measurements at cross sections of the pipe are performed. A straight pipe is investigated and compared with the 90° curved pipe. The temperature of the air flow at the inlet of the pipe is set at 402 K, and the corresponding Reynolds number is approximately 6 × 104. To obtain the spatial average temperature at each cross section, the temperature fields are measured along the streamwise of the pipes and in the circumferential direction using thermocouples at each cross section from the inlet to the outlet of both the straight and curved pipes. Furthermore, the simulation is performed for turbulent flow and heat transfer inside the pipe wall using the Re-normalization group (RNG) k-ε turbulence model and CHT method. Both the experimental and numerical results show that the curvature of the pipe result in a deviation and impingement in the high-temperature core and a separation between the wall and air, resulting in a secondary flow pattern of the temperature distribution.

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