Experimental heat transfer characteristics of a liquid in Couette motion and with Taylor vortices

1961 ◽  
Vol 261 (1305) ◽  
pp. 215-226 ◽  
Keyword(s):  
Heat Transfer ◽  
Reverse Flow ◽  
Fluid Dynamic ◽  
Fluid Motion ◽  
Heat Transfer Characteristics ◽  
Radial Temperature ◽  
Transfer Characteristics ◽  
Experimental Heat ◽  
Concentric Cylinders ◽  
Primary Fluid

The heat transfer characteristics of water in rotational motion between horizontal concentric cylinders has been studied. Primary fluid motion due to rotation of the inner cylinders alone, and due to rotation of inner cylinder with reverse flow caused by a divider, has been considered experimentally for two ratios of annulus width to inner cylinder radius. The results for two geometries and two primary fluid dynamic conditions are correlated by a parameter related to the generalized stability parameter. Radial temperature profiles are given and are shown to be effective in indicating secondary flow patterns.

Research on Flow and Heat Transfer Characteristics of Multiple Impinging Jets on a Moving Conveyor Belt

2020 ◽  
Author(s):  
Rui Liu ◽  
Yu Sun ◽  
Jun Ni
Keyword(s):  
Heat Transfer ◽  
Wind Velocity ◽  
Fluid Dynamic ◽  
Simple Algorithm ◽  
Conveyor Belt ◽  
Impinging Jets ◽  
Freezing Rate ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Confined Domains

Abstract Turbulent impinging jets at three different jet nozzle forms were numerically analyzed using the SIMPLE algorithm and k-epsilon turbulent model to investigate the flow field and heat transfer characteristics. The food placed upon a moving conveyor belt cooled by series of impinging jets under a specific condition. Three semi-confined domains with different jet nozzles were established, thereby with slot, rectangular, and funnel-shaped nozzles, respectively. Based on computational fluid dynamic (CFD) calculations, distributions of the temperature and wind velocity at four critical cross-sections of domains were compared. The results reveal that the freezing rate of foods mainly relates to temperature and wind velocity. For three semi-confined domains, the impinging jet with slot nozzles produces higher exit wind velocity, lower center temperature, and a better mass flow uniformity than others, which could better improve the heat transfer performance, and could increase the freezing rate of foods.

Realistic experimental heat transfer characteristics of radiant floor heating using sidewalls as heat sinks

2019 ◽  
Vol 183 ◽  
pp. 515-526 ◽  
Author(s):  
Ozgen Acikgoz ◽  
Yakup Karakoyun ◽  
Zehra Yumurtacı ◽  
Nihad Dukhan ◽  
Ahmet Selim Dalkılıç
Keyword(s):  
Heat Transfer ◽  
Heat Sinks ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Radiant Floor Heating ◽  
Floor Heating

Investigation on Heat Transfer Characteristics of a Cooling Channel With Dense Array of Angled Rib Turbulators

2012 ◽  
Author(s):  
Tomoko Hagari ◽  
Katsuhiko Ishida ◽  
Ken-ichiro Takeishi ◽  
Yutaka Oda ◽  
Hiroki Kitada
Keyword(s):  
Heat Transfer ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Navier Stokes ◽  
Cooling Channel ◽  
Heat Transfer Characteristics ◽  
Test Channel ◽  
Transfer Characteristics ◽  
Experimental Heat ◽  
Rib Turbulators

Heat transfer characteristics of a cooling channel with densely arranged, angled rib turbulators were investigated experimentally and numerically. The dense arrangement of the ribs is one of the potential candidates to improve heat transfer performance because of its surface area enlargement effect. The square test channel consisted of six square ribs, which were placed on one side. The ribs were arranged with a rib height to channel hydraulic diameter ratio (e/Dh) of 0.13, an angle of attack to the mainstream of 60deg, and rib pitch-to-height ratios (P/e) of 3, 6 and 10. Local heat transfer distribution on all surfaces of the rib and the floor surface between the ribs were measured by the naphthalene sublimation method. Channel Reynolds number ranges from 30,000 to 70,000. Measured data showed that the P/e of 3 provided the largest total heat transfer. It was found that 60% of heat flux was transferred through the rib surface. Numerical simulations using a Reynolds-Averaged Navier-Stokes (RANS) method and a Large Eddy Simulation (LES) were carried out for the above test cases. The RANS underestimated the experimental heat transfer data by 40–50% for all rib surfaces with close rib arrangement. On the other hand, time-averaged heat transfer distribution obtained by LES showed better agreement with experimental data. Moreover, the LES predicted the periodic large vortex structure ranging over several rib pitches. Further investigation is expected on the periodic secondary flow and the application of LES to the prediction of heat transfer in the near future.

Heat Transfer Characteristics From a Flat Plate to a Gas–Solid Two-Phase Flow Downstream of a Slit Injection

1988 ◽  
Vol 110 (3) ◽  
pp. 687-694
Author(s):  
S. Obi ◽  
K. Hishida ◽  
M. Maeda
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Flat Plate ◽  
Fluid Motion ◽  
Mass Loading ◽  
Heat Transfer Characteristics ◽  
Two Phase ◽  
Transfer Characteristics ◽  
Loading Ratio ◽  
Fine Glass

The behavior of fine glass particles and their influence on fluid motion are investigated in a flow over a flat plate downstream of a two-dimensional slit injection. Heat transfer characteristics are examined in terms of the mass loading ratio of the particles ranging up to 0.8 and particle size varying from 68.6 to 148 μm in mean diameter. The particles promote turbulence of the fluid in a weakly turbulent flow, but suppress turbulence in a strongly turbulent flow. The heat transfer characteristics along the wall are well correlated to the variation of turbulent flow field due to the effect of the particles.

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