Experimental Investigation on Water Adsorption Using Laser Photoacoustic Spectroscopy and Numerical Simulations

In the present research we propose a model to assess the water vapors adsorption capacity of a SiO2 trap in the breathing circuit, aiming to reduce the loading of interfering compounds in human breath samples. In this study we used photoacoustic spectroscopy to analyze the SiO2 adsorption of interfering compounds from human breath and numerical simulations to study the flow of expired breath gas through porous media. As a result, the highest adsorption rate was achieved with a flow rate of 300 sccm, while the lowest rate was achieved with a flow rate of 600 sccm. In the procedure of H2O removal from the human breath air samples, we determined a quantity of 213 cm3 SiO2 pearls to be used for a 750 mL sampling bag, in order to keep the detection of ethylene free of H2O interference. The data from this study encourages the premise that the SiO2 trap is efficient in the reduction of interfering compounds (like water vapors) from the human breath.

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Estimate of expired air samples of patients with the pulmonary tuberculosis using laser photoacoustic spectroscopy technique

Bulletin of Siberian Medicine ◽

10.20538/1682-0363-2012-4-116-120 ◽

2012 ◽

Vol 11 (4) ◽

pp. 116-120 ◽

Cited By ~ 3

Author(s):

B. G. Ageyev ◽

Yu. V. Kistenyov ◽

Ye. V. Nekrasov ◽

О. Yu. Nikiforova ◽

Yе. S. Nikotin ◽

...

Keyword(s):

Pulmonary Tuberculosis ◽

Photoacoustic Spectroscopy ◽

Spectroscopy Technique ◽

Air Samples ◽

Laser Photoacoustic Spectroscopy ◽

Expired Air

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Experimental investigation of a natural zeolite–water adsorption cooling unit

Applied Energy ◽

10.1016/j.apenergy.2011.04.057 ◽

2011 ◽

Vol 88 (11) ◽

pp. 4206-4213 ◽

Cited By ~ 43

Author(s):

İsmail Solmuş ◽

Bilgin Kaftanoğlu ◽

Cemil Yamalı ◽

Derek Baker

Keyword(s):

Experimental Investigation ◽

Natural Zeolite ◽

Water Adsorption ◽

Cooling Unit

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Impact of Carotid Stent Cell Design on Vessel Scaffolding: A Case Study Comparing Experimental Investigation and Numerical Simulations

Journal of Endovascular Therapy ◽

10.1583/10-3338.1 ◽

2011 ◽

Vol 18 (3) ◽

pp. 397-406 ◽

Cited By ~ 28

Author(s):

Michele Conti ◽

Denis Van Loo ◽

Ferdinando Auricchio ◽

Matthieu De Beule ◽

Gianluca De Santis ◽

...

Keyword(s):

Experimental Investigation ◽

Numerical Simulations ◽

Cell Design ◽

Carotid Stent

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Experimental Investigation of Effect of Tip Coolant Ejection on Internal Flow Characteristics Within a Realistic Blade Coolant Channel

Volume 3A: Heat Transfer ◽

10.1115/gt2013-94136 ◽

2013 ◽

Author(s):

Jian Pu ◽

Zhaoqing Ke ◽

Jianhua Wang ◽

Lei Wang ◽

Hongde You

Keyword(s):

Experimental Investigation ◽

Reynolds Number ◽

Pressure Drop ◽

Turbine Blade ◽

Flow Rate ◽

Flow Characteristics ◽

Reynolds Numbers ◽

Flow Ratio ◽

Lp Turbine ◽

Mass Flow Ratio

This paper presents an experimental investigation on the characteristics of the fluid flow within an entire coolant channel of a low pressure (LP) turbine blade. The serpentine channel, which keeps realistic blade geometry, consists of three passes connected by a 180° sharp bend and a semi-round bend, 2 tip exits and 25 trailing edge exits. The mean velocity fields within several typical cross sections were captured using a particle image velocimetry (PIV) system. Pressure and flow rate at each exit were determined through the measurements of local static pressure and volume flow rate. To optimize the design of LP turbine blade coolant channels, the effect of tip ejection ratio (ER) from 180° sharp bend on the flow characteristics in the coolant channel were experimentally investigated at a series of inlet Reynolds numbers from 25,000 to 50,000. A complex flow pattern, which is different from the previous investigations conducted by a simplified square or rectangular two-pass U-channel, is exhibited from the PIV results. This experimental investigation indicated that: a) in the main flow direction, the regions of separation bubble and flow impingement increase in size with a decrease of the ER; b) the shape, intensity and position of the secondary vortices are changed by the ER; c) the mass flow ratio of each exit to inlet is not sensitive to the inlet Reynolds number; d) the increase of the ER reduces the mass flow ratio through each trailing edge exit to the extent of about 23–28% of the ER = 0 reference under the condition that the tip exit located at 180° bend is full open; e) the pressure drop through the entire coolant channel decreases with an increase in the ER and inlet Reynolds number, and a reduction about 35–40% of the non-dimensional pressure drop is observed at different inlet Reynolds numbers, under the condition that the tip exit located at 180° bend is full open.

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Simultaneous detection of ammonia, methane and ethylene at 1.63 μm with diode laser photoacoustic spectroscopy

Applied Physics B ◽

10.1007/s00340-005-2077-x ◽

2005 ◽

Vol 82 (3) ◽

pp. 495-500 ◽

Cited By ~ 20

Author(s):

M. Scotoni ◽

A. Rossi ◽

D. Bassi ◽

R. Buffa ◽

S. Iannotta ◽

...

Keyword(s):

Diode Laser ◽

Photoacoustic Spectroscopy ◽

Simultaneous Detection ◽

Laser Photoacoustic Spectroscopy

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A3Π1u←X1Σg+ laser photoacoustic spectroscopy of Br2 vapor in the extreme red wavelength region 665–720nm

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2003.08.030 ◽

2004 ◽

Vol 60 (8-9) ◽

pp. 1889-1893 ◽

Cited By ~ 6

Author(s):

Ramesh C Sharma ◽

S.N Thakur ◽

K.C Lin

Keyword(s):

Photoacoustic Spectroscopy ◽

Wavelength Region ◽

Laser Photoacoustic Spectroscopy

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Base-Vented Hydrofoils of Finite Span Under a Free Surface: An Experimental Investigation

Journal of Ship Research ◽

10.5957/jsr.1984.28.2.90 ◽

1984 ◽

Vol 28 (02) ◽

pp. 90-106

Author(s):

Jacques Verron ◽

Jean-Marie Michel

Keyword(s):

Experimental Investigation ◽

Free Surface ◽

Flow Rate ◽

Cavity Length ◽

Three Dimensional ◽

Leading Edge ◽

Pulsation Frequency ◽

Cavity Pressure ◽

Air Flow Rate ◽

Cavity Configuration

Experimental results are given concerning the behavior of the flow around three-dimensional base-vented hydrofoils with wetted upper side. The influence of planform is given particular consideration so that the sections of the foils are simple wedges with rounded noses. Results concern cavity configuration, the relation between the air flow rate and cavity pressure, leading-edge cavitation, cavity length, pulsation frequency, and force coefficients.

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EXPERIMENTAL INVESTIGATION OF ENHANCEMENT IN EFFICIENCY OF CENTRIFUGAL PUMP BY REDUCTION IN CAVITATION OF PUMP

International Journal of Engineering Applied Sciences and Technology ◽

10.33564/ijeast.2021.v05i10.042 ◽

2021 ◽

Vol 5 (10) ◽

Author(s):

Gaffar G. Momin

Keyword(s):

Experimental Investigation ◽

Centrifugal Pump ◽

Flow Rate ◽

Rate Control ◽

Flowing Liquid ◽

Discharge Flow ◽

Pump Performance ◽

Cavitation Phenomenon ◽

Discharge Flow Rate ◽

Flow Rate Control

Cavitation phenomenon is basically a process formation of bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapour pressure and it is the most challenging fluid flow abnormalities leading to detrimental effects on both the centrifugal pump discharge characteristics as well as physical characteristics. In this low pressure zones are the first victims of cavitation. Due to cavitation pitting of impeller occurs and wear of internal walls of pumps occurs due to which there is creation of vibrations and noize are there. Due to this there is bad performance of centrifugal pump is there. Firstly, description of the centrifugal pump with its various parts are described after that pump characteristics and its important parameters are presented and discussed. Passive discharge (flow rate) control methods are utilized for improvement of flow rate and mechanical and volumetric and overall efficiency of the pump. Mechanical engineers is considering an important phenomenon which is known as Cavitation due to which there is decrease in centrifugal pump performance. There is also effect on head of the pump which is getting reduced due to cavitation phenomenon. In present experimental investigation the cavitation phenomenon is studied by starting and running the pump at various discharges and cavitating conditions of the centrifugal pump. Passive discharge (flow rate) control is realized using three different impeller blade leading edge angles namely 9.5 degrees, 16.5 degrees .and 22.5 degrees for reduction in the cavitation and increase the of the centrifugal pump performance at different applications namely, domestic, industrial applications of the centrifugal pump.

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