Ice-Formation Phenomena for Water Flow Between Two Cooled Parallel Plates

1984 ◽  
Vol 106 (3) ◽  
pp. 498-505 ◽  
Author(s):  
N. Seki ◽  
S. Fukusako ◽  
G. W. Younan
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Ice Formation ◽  
Parallel Plates ◽  
Transfer Coefficients ◽  
Water Ice ◽  
Heat Transfer Coefficients ◽  
Transition Position ◽  
Different Types ◽  
Formation Type

Experiments have been performed to investigate the ice-formation phenomena and the heat transfer characteristics for water flow between two horizontal parallel plates. The experiments were carried out under the condition that the upper and lower plates were cooled at the same uniform temperature, which was less than the freezing and the temperature of the water. The temperature of the plates ranged from −7 to −14°C with inlet-water temperature varied from 2 to 5°C. The cooling-temperature ratio θc ranged from 1.4 to 7.0. By using three different values of height H, 16, 30, and 40 mm between the horizontal parallel plates, the Reynolds number ReH were varied from 3.8 × 103 to 3.2 × 104. As a result of the present investigation, two different types of ice-formation were observed. One was transition ice-formation type, and the other was smooth ice-formation type. It was found that the transition ice-formation type occurred for ReH/θc0.741 < 104, while the smooth ice-formation type occurred for ReH/θc0.741 > 104. The relation equations for the ice-transition position and the heat transfer coefficients along the water-ice interface were extensively determined.

Modeling Subcooled Flow Film Boiling in a Vertical Tube

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
Meamer El Nakla ◽  
D. C. Groeneveld ◽  
Shui-Chih Cheng
Keyword(s):  
Heat Transfer ◽  
Film Boiling ◽  
Average Error ◽  
Parallel Plates ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Wide Range ◽  
Rms Error ◽  
Rms Errors ◽  
Flow Film Boiling

A two-fluid one-dimensional model has been developed to predict the wall temperature of an internally heated tube during inverted annular flow film boiling (IAFB). The model is derived using basic conservation equations of mass, momentum, and energy. To simplify the derivation of the constitutive heat transfer relations, flow between two parallel plates is assumed. The model features shear stress and interfacial relations that make it accurately predict the parametric effects and heat transfer characteristics of IAFB over a wide range of flow conditions. The model predicts wall temperatures of R-134a-cooled tubes with an average error of −1.21% and a rms error of 6.37%. This corresponds to average and rms errors in predicted heat transfer coefficients of 1.33% and 10.07%, respectively. Using water data, the model predicts wall temperatures with an average error of −1.76% and a rms error of 7.78%, which corresponds to average and rms errors in predicted heat transfer coefficients of 4.16% and 15.06%, respectively.

Condensation Measurement of Horizontal Cocurrent Steam/Water Flow

1984 ◽  
Vol 106 (2) ◽  
pp. 425-432 ◽  
Author(s):  
I. S. Lim ◽  
R. S. Tankin ◽  
M. C. Yuen
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Water Layer ◽  
Transfer Coefficients ◽  
Flow Rates ◽  
Heat Transfer Coefficients ◽  
Nusselt Numbers ◽  
Wavy Interface ◽  
Prandtl Numbers ◽  
Inlet Conditions

Condensation of steam on a subcooled water layer was studied in a cocurrent horizontal channel at atmospheric pressure. The heat transfer coefficients were found to vary from 1.3 kW/m2°C to 20 kW/m2°C, depending on whether the liquid interface was smooth or wavy, increased with increasing steam flow rates and water flow rates. For all cases, 50 to 90 percent of the steam condensed within 1.2 m from the entrance. The average Nusselt numbers were correlated with average steam and water Reynolds numbers and average liquid Prandtl numbers, for both smooth and wavy interface flows. Finally, a correlation of the average heat transfer coefficient and condensation rate for wavy interface flow was obtained as a function of inlet conditions and distance downstream.

scholarly journals Jeffrey Fluid Behaviour on Oscillatory Couette Flow past Two Horizontal Parallel Plates in Presence of MHD and Radioactive Heat Transfer

2019 ◽  
Vol 8 (11) ◽  
pp. 3252-3257
Keyword(s):  
Heat Transfer ◽  
Finite Difference ◽  
Couette Flow ◽  
Jeffrey Fluid ◽  
Physical Parameters ◽  
Parallel Plates ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Fluid Behaviour ◽  
Non Linear System

The aim of this study carry out on an unsteady MHD at no cost convective oscillatory Couette flow of a wellknown non-Newtonian Jeffrey fluid of an optically thin fluid bounded by two horizontal porous parallel walls in a channel embedded in porous medium in the presence of thermal radiation and angle of inclination. Design and Method is the flow is governed by a coupled non-linear system of partial differential equations which are solved numerically by using finite difference method. Results are the impacts of various physical parameters on the flow quantities viz. velocity and temperature reports, skinfriction and rate of heat transfer coefficients are studied numerically. The results are discussed with the help of graphs and tables. Conclusion is the finite difference results are compared favourably with already established results in literatures.

Influences of External Windows on Energy Consumption of Industrial Buildings in Cold Areas

2011 ◽  
Vol 250-253 ◽  
pp. 3055-3058 ◽  
Author(s):  
Hong Wei Wang ◽  
Ya Dong Zheng ◽  
Fang Wen Tu
Keyword(s):  
Heat Transfer ◽  
Energy Consumption ◽  
Energy Saving ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Industrial Buildings ◽  
Different Types ◽  
Insulation Performance ◽  
The Heat Transfer Coefficient ◽  
Plastic Steel

Shenyang is located in the cold areas and main industy city in China. The most current industrial buildings can’t meet the demand of energy-saving standard because of the thermal insulation performance of the windows.This paper aims at using DeST software to analyze industrial workshop energy consumption, according to different types of external windows and window-wall ratio of buildings to provide reference for energy saving design of industrial buildings in Shenyang area.The thermal performance of the windows has great effect on the heat load. The lower the heat transfer coefficient of windows is, the more beneficial for energy saving of the buildings. The window-wall ratio has great effect on the energy consumption, and different heat-transfer coefficients possess various sensitivity for window-wall ratio, and reflective glass varis smaller than the others.It is better for energy saving to replace the conventional windows with plastic-steel reflective glass windows.

An Experimental Investigation of Ice Formation around an Isothermally Cooled Cylinder in Crossflow

1981 ◽  
Vol 103 (4) ◽  
pp. 733-738 ◽  
Author(s):  
K. C. Cheng ◽  
Hideo Inaba ◽  
R. R. Gilpin
Keyword(s):  
Heat Transfer ◽  
Series Solution ◽  
Reynolds Numbers ◽  
Cooling Capacity ◽  
Ice Formation ◽  
Correlation Equations ◽  
Transfer Coefficients ◽  
Average Heat ◽  
Heat Transfer Coefficients ◽  
Ice Water

The problem of steady-state, two-dimensional ice formation around an isothermally cooled circular cylinder in a crossflow is studied experimentally for the ranges of Reynolds numbers, Red, 2.3 × 102 to 8.6 × 104 and cooling temperature ratios, θc, 6.3 to 75.8. The local and average heat transfer coefficients at the ice-water interface are obtained from measured ice profiles by using a series solution of the Laplace equation in the ice. Correlation equations for the average heat transfer are obtained for three regimes of Reynolds numbers. A correlation is also obtained for the cooling capacity that can be stored in the ice layer around a cylinder.

A Table for Heat Transfer Coefficients in the Postcritical Region in the Case of Water Flow in a Tube (The Version of the Year 1997)

2001 ◽  
Vol 32 (1-3) ◽  
pp. 7
Author(s):  
A. D. Efanov ◽  
P. L. Kirillov ◽  
I. P. Smogalev ◽  
A. A. Ivashkevich ◽  
V. N. Vinogradov ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Water Flow ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

Condensation of R134a Flowing Inside Horizontal and Vertical Helicoidal Pipe

1999 ◽  
Author(s):  
H. J. Kang ◽  
C. X. Lin ◽  
M. A. Ebadian
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Water Flow ◽  
Heat Transfer Characteristic ◽  
Cooling Water ◽  
Transfer Characteristic ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Mass Fluxes ◽  
Flow Reynolds Number

Abstract Condensing heat transfer characteristic of an ozone-friendly refrigerant HFC-R134a (Hydrofluorocarbon R134a) flowing inside a 12.7mm helicoidal tube was investigated experimentally to obtain heat transfer data and correlations. For this long helicoidal pipe at horizontal and vertical helicoidal positions, heat transfer measurements were performed for the refrigerant flow mass fluxes from 100 to 400 kg/m2/s, in the cooling water flow Reynolds number range of 1500 &lt; Rew &lt; 9000 at fixed system temperature (33°C) and cooling tube wall temperature (12°C and 22°C). Experimental results show that, with the increase of mass flux, the overall condensing heat transfer coefficients of R134a increase. However, with the increase of mass flux (or the cooling water flow Reynolds number), the refrigerant side heat transfer coefficients decrease. The effects of cooling wall temperature on heat transfer coefficients were considered. Predictive correlations valid over the above water flow Reynolds number ranges and refrigerant flow mass fluxes were proposed. Helicoidal pipe heat transfer characteristics were compared with data from literature reports for horizontal straight tube. Experimental results show that helicoidal pipe, especially at horizontal position, conducts a much better heat transfer characteristic than that of horizontal tube even it was grooved. The helicoidal pipe’s position plays a very great role on heat transfer characteristic with 100 percent higher results at a horizontal position than that of vertical position.

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