Numerical Study of Thermal Stratification in a Liquid Storage Tank With a Porous Manifold

Solar Energy ◽  
2006 ◽  
Author(s):  
N. M. Brown ◽  
F. C. Lai
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Storage Tank ◽  
Richardson Number ◽  
Thermal Stratification ◽  
Numerical Study ◽  
Temperature Fields ◽  
Liquid Storage ◽  
Wide Range ◽  
Liquid Storage Tank

A numerical model has been developed to study the effects of a porous manifold on thermal stratification in a storage tank. The model is used to predict the development of flow and temperature fields during a charging process. Computations have covered a wide range of the Grashof number (1.8 × 105 < Gr < 1.8 × 108) and Reynolds number (10 ≤ Re ≤ 104), or in terms of the Richardson number, 0.1 < Ri < 105. The results obtained compare favorably well with the experimental data. In addition, the present results have confirmed the effectiveness of porous manifold in the promotion of thermal stratification and provide useful information for the design of such system.

Effect of Size and Slip Coefficient of a Porous Manifold on Thermal Stratification in Storage Tanks

2009 ◽  
Author(s):  
N. M. Brown ◽  
F. C. Lai
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Numerical Simulations ◽  
Storage Tank ◽  
Richardson Number ◽  
Thermal Stratification ◽  
Temperature Fields ◽  
Storage Tanks ◽  
Slip Coefficient ◽  
Wide Range

Numerical simulations have been performed to study the effects of size and slip coefficient of a porous manifold on the thermal stratification in a storage tank. The model is used to predict the development of flow and temperature fields during a charging process. Computations have covered a wide range of the Grashof number (1.8 × 105 &lt; Gr &lt; 1.8 × 108) and Reynolds number (10 ≤ Re ≤ 104), or in terms of the Richardson number, 10−2 &lt; Ri &lt; 105. The results obtained compare favorably well with the experimental data. In addition, the present results have confirmed the effectiveness of porous manifold in the promotion of thermal stratification and provide useful information for the design of such system.

Measurement of Permeability and Slip Coefficient of Porous Tubes

Volume 1 ◽  
2004 ◽  
Author(s):  
N. M. Brown ◽  
F. C. Lai
Keyword(s):  
Reynolds Number ◽  
Wall Thickness ◽  
Storage Tank ◽  
Thermal Stratification ◽  
Porous Wall ◽  
Interface Condition ◽  
Outer Diameter ◽  
Slip Coefficient ◽  
Liquid Storage ◽  
Liquid Storage Tank

Experiments have been conducted to measure the permeability and slip coefficient of seven porous tubes. These tubes are to be used in a liquid storage tank to enhance thermal stratification. They were made from fiberglass and nylon nettings with various wall thicknesses. Six tubes had an outer diameter of 1.9 cm and a thickness ranging from 0.158 cm to 0.635 cm, and the seventh tube had an outer diameter of 10 cm and a thickness of 0.635 cm. Tests show that these tubes have a distinct permeability in the longitudinal and radial directions. As such, both permeabilities of the tubes were measured. In addition, the slip coefficient which is an important parameter in the Beaver-Joseph interface condition was determined. From the results obtained, one can conclude that both permeabilities depend on the material, but the radial permeability also depends on the wall thickness. The slip coefficient depends not only on the material but also on the Reynolds number, permeabilities and porous wall thickness.

Experimental Study of Stratification in a Liquid Storage Tank With a Porous Manifold

Volume 4 ◽  
2004 ◽  
Author(s):  
N. M. Brown ◽  
F. C. Lai
Keyword(s):  
Experimental Study ◽  
Flow Visualization ◽  
Storage Tank ◽  
Richardson Number ◽  
Thermal Stratification ◽  
Thermal Storage ◽  
Stable Stratification ◽  
Height Ratio ◽  
Liquid Storage ◽  
Liquid Storage Tank

Experiments were conducted to investigate the effectiveness of a porous manifold in the formation and maintenance of thermal stratification in a liquid storage tank. A thermal storage tank with a capacity of 315 liters and a diameter-to-height ratio of 2 was used for the experiment. The porous manifold used was made from rolling up a nylon screen into the shape of a tube. Stratification was observed at a Richardson number as low as Ri = 0.615. Flow visualization was also performed to confirm the effectiveness of the porous manifold in the promotion and maintenance of stable thermal stratification. From the results of flow visualization, one can conclude that a porous manifold is able to reduce the shear-induced mixing between fluids of different temperature, and thus is able to promote and maintain a stable stratification.

scholarly journals Damage Identification Based on Adding Mass for Liquid–Solid Coupling Structures

2020 ◽  
Vol 10 (7) ◽  
pp. 2312
Author(s):  
Jilin Hou ◽  
Haiyan Wang ◽  
Dengzheng Xu ◽  
Łukasz Jankowski ◽  
Pengfei Wang
Keyword(s):  
Experimental Data ◽  
Cantilever Beam ◽  
Storage Tank ◽  
Damage Identification ◽  
Local Damage ◽  
Fundamental Theory ◽  
Attached Mass ◽  
Experimental Conditions ◽  
Liquid Storage ◽  
Liquid Storage Tank

Damage identification for liquid–solid coupling structures remains a challenging topic due to the influence of liquid and the limitation of experimental conditions. Therefore, the adding mass method for damage identification is employed in this study. Adding mass to structures is an effective method for damage identification, as it can increase not only the experimental data but also the sensitivity of experimental modes to local damage. First, the fundamental theory of the adding mass method for damage identification is introduced. After that, the method of equating the liquid to the attached mass is proposed by considering the liquid–solid coupling. Finally, the effectiveness and reliability of damage identification, based on adding mass for liquid–solid coupling structures, are verified through experiments of a submerged cantilever beam and liquid storage tank.

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