scholarly journals Investigation of pressure loss in a circular pipe under ultrasonic waves released along main stream flow

2021 ◽  
Vol 1137 (1) ◽  
pp. 012064
Author(s):  
Pongsapak Treegosol ◽  
Jetsadaporn Priyadumkol ◽  
Kanet Katchasuwanmanee ◽  
Weerachai Chaiworapuek
Keyword(s):  
Pressure Loss ◽  
Stream Flow ◽  
Ultrasonic Waves ◽  
Circular Pipe ◽  
Main Stream

1906 Reduction of the Pressure Loss by the Addition of the Organic Nano Tube in the Circular Pipe Flow

2012 ◽  
Vol 2012.18 (0) ◽  
pp. 73-74
Author(s):  
Yuki INAIDA ◽  
Atsushi TAKEYAMA ◽  
Donghyuk KANG ◽  
Kazuhiko YOKOTA
Keyword(s):  
Pipe Flow ◽  
Pressure Loss ◽  
Circular Pipe ◽  
Circular Pipe Flow

Double Wall Cooling of an Effusion Plate With Simultaneous Cross Flow and Impingement Jet Array Internal Cooling

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
David Ritchie ◽  
Austin Click ◽  
Phillip M. Ligrani ◽  
Federico Liberatore ◽  
Rajeshriben Patel ◽  
...  
Keyword(s):  
Heat Flux ◽  
Reynolds Number ◽  
Stream Flow ◽  
Cross Flow ◽  
Main Stream ◽  
Streamwise Location ◽  
Net Heat Flux ◽  
Contraction Ratio ◽  
The Cross ◽  
Double Wall

Considered is double wall cooling, with full-coverage effusion-cooling on the hot side of the effusion plate, and a combination of impingement cooling and cross flow cooling, employed together on the cold side of the effusion plate. Data are given for a main stream flow passage with a contraction ratio (CR) of 4 for main stream Reynolds numbers Rems and Rems,avg of 157,000–161,000 and 233,000–244,000, respectively. Hot-side measurements (on the main stream flow or hot side of the effusion plate) are presented, which are measured using infrared thermography. Using a transient thermal measurement approach, measured are spatially resolved distributions of surface adiabatic film cooling effectiveness, and surface heat transfer coefficient. For the same Reynolds number, initial blowing ratio (BR), and streamwise location, increased thermal protection is often provided when the effusion coolant is provided by the cross flow/impingement combination configuration, compared to the cross flow only supply arrangement. In general, higher adiabatic effectiveness values are provided by the impingement only arrangement, relative to the impingement/cross flow combination configuration, when compared at the same Reynolds number, initial BR, and x/de location. Data for one streamwise location of x/de = 60 show that the highest net heat flux reduction line-averaged net heat flux reduction (NHFR) values are produced either by the impingement/cross flow combination configuration or by the impingement only arrangement, depending upon the particular magnitude of BR, which is considered.

Effect of finite width cavity in axisymmetric supersonic flow field

2016 ◽  
Vol 232 (1) ◽  
pp. 180-184 ◽  
Author(s):  
S Jeyakumar ◽  
K Jayaraman
Keyword(s):  
Supersonic Flow ◽  
Flow Field ◽  
Test Section ◽  
Pressure Loss ◽  
Supersonic Nozzle ◽  
Stagnation Pressure ◽  
Test Facility ◽  
Main Stream ◽  
Finite Width ◽  
Constant Length

In this research, the effect of finite width cavities in supersonic flow field is experimentally investigated. The test facility consists of a supersonic nozzle, which provides flow Mach number of 1.9. A circular cross-sectional test section is fastened at the exit of the nozzle. Cavities are incorporated in the test section at a distance of 20 mm from the inlet. Cavities of constant length and width, and varying depth are used for the study. Entrainment of flow in the main stream is observed immediate downstream of the cavity aft edge due to three dimensional effect. As the depth of the cavity is increased, residence time of the fluid as well as the mixing characteristics are enhanced and stagnation pressure loss also increased. Twin cavities are also arranged symmetrically, which further leads to an improvement in mixing with marginal rise in stagnation pressure loss.

Flow Control in a Mixing-Vane Grid to Enhance Thermal Hydraulic Performance

2010 ◽  
Author(s):  
Tsutomu Ikeno ◽  
Tatsuya Sasakawa ◽  
Shumpei Kakinoki ◽  
Momonori Murase
Keyword(s):  
Heat Flux ◽  
Flow Control ◽  
Pressure Loss ◽  
Axial Direction ◽  
Nucleate Boiling ◽  
Swirl Flow ◽  
Projection Area ◽  
Main Stream ◽  
Two Phase ◽  
Rod Bundle

To investigate the effect of mixing-vane shape, heat flux at departure from nucleate boiling (DNB) and pressure loss were measured. Computational fluid dynamics (CFD) was utilized to discuss the flow control. The pressure loss and the DNB tests were performed in a water and a Freon loops, respectively. Two mixing-vanes were designed to have same projection area but different inclination. The rod-bundle was 5 by 5 and 17 by 17 respectively at the water and Freon tests. The experimental results showed that the slightly inclined mixing-vane produced the same DNB heat flux as the deeply inclined mixing-vane and did smaller pressure loss than it. Pressure loss of the two mixing-vane grids was different in spite of the same projection area. The result of CFD showed a swirl flow decaying along the main stream in the axial direction. The swirl was stronger in the deeply inclined mixing-vane, however it decayed faster whereas one maintained long in the slightly inclined mixing-vane. This result suggested that the deep inclination caused a steep change in axial momentum to induce strong turbulence diffusion. This flow structure did not change the DNB heat flux because the two-phase discontinuity dominated the phenomena. This study provided a successful example of flow control in a mixing-vane grid.

S055013 Pressure loss characteristics of the Organic Nano Tube aqueous solution flows in the circular pipe

2011 ◽  
Vol 2011 (0) ◽  
pp. _S055013-1-_S055013-5
Author(s):  
Atsushi TAKEYAMA ◽  
Nobuyoshi HUZIMATU ◽  
Kazuhiko YOKOTA ◽  
Masumi ASAKAWA
Keyword(s):  
Aqueous Solution ◽  
Pressure Loss ◽  
Circular Pipe

scholarly journals WATER TEMPERATURE VARIATIONS WITHIN A MAJOR RIVER SYSTEM

1975 ◽  
Vol 6 (3) ◽  
pp. 155-169 ◽  
Author(s):  
K. SMITH
Keyword(s):  
Water Temperature ◽  
Air Temperature ◽  
Stream Flow ◽  
River System ◽  
Daily Maximum ◽  
Main Stream ◽  
Temperature Variations ◽  
River Temperature ◽  
Air Temperatures ◽  
Storm Rainfall

This paper examines the relationships between river water temperature, air temperature and stream flow measured continuously for one year at four sites along the main stream of the river Tees in northern England. Maximum and minimum river temperatures were found to correlate fairly closely with equivalent air temperatures at each site, but some emphasis was placed on the effects of hydrological factors on water temperature variations within the 818 km2 basin. The range of water temperature fluctuations was shown to increase upstream and the highest river maxima were also recorded in the upper reaches of the river, owing to the relatively low volume of discharge. On a shorter time scale, stream flow was also found to exert an important influence on river temperature during snowmelt and peak flow events arising from storm rainfall. A multiple regression analysis indicated that air temperature and stream flow together accounted for up to 85 % of the variation of daily maximum and minimum river temperatures in summer.

scholarly journals EFFECTS OF FLOW VARIATIONS ON THE SALT CONTENT AND REACTION OF A MOUNTAIN CREEK

1964 ◽  
Vol 44 (3) ◽  
pp. 352-359 ◽  
Author(s):  
H. C. Korven ◽  
J. C. Wilcox
Keyword(s):  
Electrical Conductivity ◽  
Water Supply ◽  
Water Samples ◽  
Stream Flow ◽  
Salt Content ◽  
Mountain Stream ◽  
Main Stream ◽  
Irrigation Season ◽  
Storage Reservoirs ◽  
Positive Correlations

Water samples were taken and the stream flow measured at intervals during the summer, 1962, at several locations on a mountain stream and its tributaries which are a source of water for domestic and irrigation purposes for Summerland, B.C. Electrical conductivity and pH were determined for each sample and related to flow. There were highly significant negative correlations between the amount of water flowing past any given point in a stream and both conductivity and pH of the water at that point. Conductivity and pH showed high positive correlations. Considering the main stream on any one date, there was an increase in salt content of the water with a decrease in elevation. Storage reservoirs were beneficial because during the major portion of the irrigation season when storage water was being used, the increased flow meant a water supply of lower salt content and alkalinity than would be the case under normal stream flow.

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