Flow characteristics and circulatory motion in wavy falling films with and without counter-current gas flow

Strip seals are used in gas turbine engines between two static elements or between components which do not move relative to each other, such as Nozzle Guide Vanes (NGVs). The key role of a strip seal between NGV segments is sealing between the flow through the main stream annulus and the internal air system, a further purpose is to limit the inter-segmental movements. In general the shape of the strip seal is a rectangular strip that fits into two slots in adjacent components. The minimum clearance required for static strip seals must be found by accounting for thermal expansion, misalignment, and application, to allow correct fitment of the strip seals. Any increase in leakage raises the cost due to an increase in the cooling air use, which is linked to specific fuel consumption, and it can also alter gas flow paths and performance. The narrow path within the seal assembly, especially the height has the most significant affect on leakage. The height range of the narrow path studied in this paper is 0.01–0.06 mm. The behaviour of the flow passing through the narrow path has been studied using CFD modelling and measurements in a bespoke rig. The CFD and experimental results show that normalized leakage flow increases with pressure ratio before reaching a maximum. The main aim of this paper is to provide new experimental data to verify the CFD modelling for static strip seals. The typical flow characteristics validated by CFD modelling and experiments can be used to predict the flow behaviour for future static strip seal designs.

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Extended Thermodynamic Approach for Non-Equilibrium Gas Flow

Communications in Computational Physics ◽

10.4208/cicp.301011.180512a ◽

2013 ◽

Vol 13 (5) ◽

pp. 1330-1356 ◽

Cited By ~ 8

Author(s):

G. H. Tang ◽

G. X. Zhai ◽

W. Q. Tao ◽

X. J. Gu ◽

D. R. Emerson

Keyword(s):

Heat Transfer ◽

Equilibrium State ◽

Gas Flow ◽

Rarefied Gas ◽

Flow Characteristics ◽

Bimodal Distribution ◽

Thermodynamic Approach ◽

Navier Stokes ◽

Extended Thermodynamic ◽

Non Equilibrium

AbstractGases in microfluidic structures or devices are often in a non-equilibrium state. The conventional thermodynamic models for fluids and heat transfer break down and the Navier-Stokes-Fourier equations are no longer accurate or valid. In this paper, the extended thermodynamic approach is employed to study the rarefied gas flow in microstructures, including the heat transfer between a parallel channel andpressure-driven Poiseuille flows through a parallel microchannel andcircular microtube. The gas flow characteristics are studied and it is shown that the heat transfer in the non-equilibrium state no longer obeys the Fourier gradient transport law. In addition, the bimodal distribution of streamwise and spanwise velocity and temperature through a long circular microtube is captured for the first time.

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EVALUASI KINERJA METHYL DIETHANOL AMINE (MDEA) DALAM PENYERAPAN KANDUNGAN H2S PADA PROSES PENGOLAHAN GAS ALAM

EKOLOGIA ◽

10.33751/ekologia.v20i1.1986 ◽

2020 ◽

Vol 20 (1) ◽

pp. 45-51

Author(s):

. Sutanto ◽

Ade Heri Mulyati ◽

. Hermanto

Keyword(s):

Natural Gas ◽

Flow Rate ◽

Gas Flow ◽

Acid Gas ◽

Amine Solution ◽

A Value ◽

Logarithmic Equation ◽

Counter Current ◽

Column Outlet ◽

Sour Gas

Drilling natural gas contains water vapor (H2O) and contaminant gases such as CO2 and H2S which must be removed because it reduced the calorie value of the product. H2S gas is also corrosive, easily damaging equipment so that it increased maintenance costs. The process of removing CO2 and H2S gas uses MDEA (methyl diethanolamine). This study aims to determine the optimal concentration and flow rate of absorbent methyl diethanolamine (MDEA) to absorb H2S in the plant I gas flow in Energy Equity Epic (Sengkang) Pty.Ltd. The study was carried out with a steady MDEA mix absorbent flow rate (50% pure amine and 50% demineralization water) fixed at 13 US Gallons per minute flowing continuously at the upper absorber inlet, sour gas flow rate, at the bottom of the absorber inlet with variations in the flow gas namely 7,9,11,13,15,17 MMSCFD and is contacted with amine solution counter-current. Purified natural gas (sweet gas) produced from the top absorber column outlet with an H2S content below 10 ppm. The results showed that the greater the flow rate of gas inlet, the greater the acid gas absorbed. The amount of gas entering and exiting gas follows the equation y = 0.003 x - 2.2537. The ability of the amine solution to absorb H2S follows the logarithmic equation y = 0.167 ln (x) + 101.02 with a value of R = 0.9857, y is H2S absorbed by the amine solution and x is the H2S rate.

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Gas flow characteristics of porous permeable metals

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00794333 ◽

1982 ◽

Vol 21 (12) ◽

pp. 938-940

Author(s):

A. A. Antonov ◽

A. É. Bespalov

Keyword(s):

Gas Flow ◽

Flow Characteristics

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