Small-scale low pressure ‘single effect distillation’ and ‘single stage flash’ solar driven barometric desalination units: A comparative analysis

Desalination ◽  
2018 ◽  
Vol 444 ◽  
pp. 53-62 ◽  
Author(s):  
Mansoor Siddique ◽  
Nedim Turkmen ◽  
Omar M. Al-Rabghi ◽  
Elsayed Shabana ◽  
Mohammed H. Albeirutty
Keyword(s):  
Comparative Analysis ◽  
Low Pressure ◽  
Single Stage ◽  
Small Scale ◽  
Single Effect

scholarly journals Comparison of Two Single Stage Low-Pressure Rotary Lobe Expander Geometries in Terms of Operation

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4512
Author(s):  
Michalina Kurkus-Gruszecka ◽  
Piotr Krawczyk
Keyword(s):  
Cfd Simulation ◽  
Mechanical Energy ◽  
Electric Energy ◽  
Low Pressure ◽  
Single Stage ◽  
Small Scale ◽  
Operational Parameters ◽  
Data Simulation ◽  
Time Step ◽  
Geometry Model

In the article the computational fluid dynamics (CFD) simulation and calculated operational parameters of the single stage low-pressure rotary lobe expander compared with the values obtained from a different geometry simulation are presented. Low-pressure rotary lobe expanders are rotary engines that use a compressed gas to produce mechanical energy, which in turn can be converted into another form, i.e., electric energy. Currently, expanders are used in narrow areas, but have a large potential in the energy production from gases of low thermodynamic parameters. The first geometry model was designed on the basis of an industrial device and validated with the empirical data. Simulation of the second geometry was made based on a validated model in order to estimate the operational parameters of the device. The CFD model included the transient simulation of compressible fluid in the geometry changing over time and the rotors motion around two rotation axes. The numerical model was implemented in ANSYS CFX software. After obtaining simulation results in the form of parameters monitors for each time step, a number of calculations were performed using a written code analysing the CFD program output files. The article presents the calculation results and the geometries comparison in terms of work efficiency. The research indicated that the construction of the device on a small scale could cause a significant decrease in the aforementioned parameter, caused by medium leaks in the expander clearances.

Comparative analysis of the magnetoelectric drive with linear drives of low-speed single-stage piston units

2020 ◽  
Author(s):  
A. A. Tatevosyan ◽  
S. S. Busarov ◽  
R. E. Kobyl'skiy ◽  
T. A. Zamiralova
Keyword(s):  
Comparative Analysis ◽  
Single Stage ◽  
Low Speed

Pressure Distributions in the Tip Clearance Region of an Unshrouded Axial Turbine as Affecting the Problem of Tip Burnout

1987 ◽  
Author(s):  
Jeffery P. Bindon
Keyword(s):  
Separation Bubble ◽  
Low Pressure ◽  
High Heat ◽  
Tip Clearance ◽  
Small Scale ◽  
Narrow Strip ◽  
Pressure Surface ◽  
High Heat Transfer ◽  
Axial Turbines ◽  
Secondary Vortices

The pressure distribution in the tip clearance region of a 2D turbine cascade was examined with reference to unknown factors which cause high heat transfer rates and burnout along the edge of the pressure surface of unshrouded cooled axial turbines. Using a special micro-tapping technique, the pressure along a very narrow strip of the blade edge was found to be 2.8 times lower than the cascade outlet pressure. This low pressure, coupled with a thin boundary layer due to the intense acceleration at gap entry, are believed to cause blade burnout. The flow phenomena causing the low pressure are of very small scale and do not appear to have been previously reported. The ultra low pressure is primarily caused by the sharp flow curvature demanded of the leakage flow at gap entry. The curvature is made more severe by the apparent attachement of the flow around the corner instead of immediately separating to increase the radius demanded of the flow. The low pressures are intensified by a depression in the suction corner and by the formation of a separation bubble in the clearance gap. The bubble creates a venturi action. The suction corner depression is due to the mainstream flow moving round the leakage and secondary vortices.

Small-scale dynamic structures in low-pressure microwave discharges

1997 ◽  
Vol 40 (8) ◽  
pp. 663-671 ◽  
Author(s):  
N. V. Vvedenskii ◽  
N. K. Vdovicheva ◽  
V. B. Gil’denburg ◽  
N. A. Zharova ◽  
I. A. Shereshevskii ◽  
...  
Keyword(s):  
Low Pressure ◽  
Small Scale ◽  
Dynamic Structures ◽  
Microwave Discharges

Investigation on small-scale low pressure LNG production process

2018 ◽  
Vol 227 ◽  
pp. 672-685 ◽  
Author(s):  
M.A. Ancona ◽  
M. Bianchi ◽  
L. Branchini ◽  
A. De Pascale ◽  
F. Melino ◽  
...  
Keyword(s):  
Production Process ◽  
Low Pressure ◽  
Small Scale

scholarly journals New Perspectives on the Urban–Rural Dichotomy and Dialect Contact in the Arabic gələt Dialects in Iraq and South-West Iran

Languages ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 198
Author(s):  
Bettina Leitner
Keyword(s):  
Comparative Analysis ◽  
Urban Space ◽  
Native Speakers ◽  
Small Scale ◽  
Alternative Analysis ◽  
Dialect Contact ◽  
New Approach ◽  
Geographic Context ◽  
Urban Rural

This paper reevaluates the ground on which the division into urban and rural gələt dialects, as spoken in Iraq and Khuzestan (south-western Iran), is built on. Its primary aim is to describe which features found in this dialect group can be described as rural and which features tend to be modified or to emerge in urban contexts, and which tend to be retained. The author uses various methodical approaches to describe these phenomena: (i) a comparative analysis of potentially rural features; (ii) a case study of Ahvazi Arabic, a gələt dialect in an emerging urban space; and (iii) a small-scale sociolinguistic survey on overt rural features in Iraqi Arabic as perceived by native speakers themselves. In addition, previously used descriptions of urban gələt features as described for Muslim Baghdad Arabic are reevaluated and a new approach and an alternative analysis based on comparison with new data from other gәlәt dialects are proposed. The comparative analysis yields an overview of what has been previously defined as rural features and additionally discusses further features and their association with rural dialects. This contributes to our general understanding of the linguistic profile of the rural dialects in this geographic context.

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