Pressure distribution of central cone silos during filling and discharge: Multi-scale experimental study

The paper presents a review of analytical and experimental work which has been done on flows in rotating ducts. It presents the results of an experimental study to measure the secondary flows predicted by the previous analytical work. A duct of approximately 3 ft in length with a cross section of 2 × 5 in. was rotated up to speeds of 300 rpm. Air was used as the working fluid. Static pressures, total pressures, and yaw angles were measured at selected points along the channel. The flow regime examined was the developing flow from the entrance to the exit of the channel. Examination of the data revealed the presence of two longitudinal vortices which extended the length of the channel. Pressure distribution across the height of the channel and across the width of the channel was obtained. The magnitude of the cross-flow velocities in the channel were determined and mapped. It was found that the data for various rotational speeds could be collapsed upon a single curve by dividing all data by the rotational speeds. The results of the experimental study provide solid verification for the hypothesis of longitudinal vortices in rotating ducts.

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WIND PRESSURE DISTRIBUTION ON LOW-RISE BUILDINGS WITH CYLINDRICAL ROOFS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2015.193 ◽

2015 ◽

Vol 2 (1) ◽

Author(s):

Astha Verma ◽

Ashok Kumar Ahuja

Keyword(s):

Boundary Layer ◽

Experimental Study ◽

Wind Tunnel ◽

Pressure Distribution ◽

Open Circuit ◽

Wind Pressure ◽

Wind Loads ◽

Wind Loading ◽

Pressure Coefficients ◽

Available Information

Wind is one of the important loads to be considered while designing the roofs of low-rise buildings. The structural designers refer to relevant code of practices of various countries dealing with wind loads while designing building roofs. However, available information regarding wind pressure coefficients on cylindrical roofs is limited to single span only. Information about wind pressure coefficients on multi-span cylindrical roofs is not available in standards on wind loads. Present paper describes the details of the experimental study carried out on the models of low-rise buildings with multi-span cylindrical roofs in an open circuit boundary layer wind tunnel. Wind pressure values are measured at many pressure points made on roof surface of the rigid models under varying wind incidence angles. Two cases namely, single-span and two-span are considered. The experimental results are presented in the form of contours of mean wind pressure coefficients. Results presented in the paper are of great use for the structural designers while designing buildings with cylindrical roofs. These values can also be used by the experts responsible for revising wind loading codes from time to time.

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Experimental investigation into transonic flows over tandem cavities

The Aeronautical Journal ◽

10.1017/s0001924000092034 ◽

2001 ◽

Vol 105 (1045) ◽

pp. 119-124 ◽

Cited By ~ 3

Author(s):

N. Taborda ◽

D. Bray ◽

K. Knowles

Keyword(s):

Experimental Study ◽

Experimental Investigation ◽

Mach Number ◽

Pressure Distribution ◽

Static Pressure ◽

Transonic Flows ◽

Wide Range ◽

Different Dimensions

AbstractAn experimental study was conducted to analyse the pressure distribution along the floor of a cavity, with and without the presence of an upstream tandem cavity, at a constant freestream Mach number of about 0-911. Measurements were made for single cavities and the results compared with those obtained in the presence of an upstream tandem cavity. This comparison was made over a wide range of geometries, covering open to closed classes of cavities with both identical and different dimensions for the two cavities. The effect of the spacing between the two cavities was also studied. The downstream cavity is shown to be significantly affected by the presence of an upstream cavity, with both the overall net static pressure and its gradient being affected, dependent upon the class of cavity geometry and spacing under consideration.

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