In situ non-intrusive measurements of water vapor partial pressure and temperature were performed simultaneously along two gas channels on he cathode side of a PEM fuel cell using tunable diode laser absorption spectroscopy. This measurement technique developed by us was utilized arlier to make measurements in a single bipolar plate channel of a prototype PEM fuel cell. The current study examin...

extended abstract abstract pressure management is an effective method for water demand management. for evaluation of the effects of pressure changes on leakage level of water networks, the favad equation is usually used. however, in this equation, exponent of pressure parameter (n) needs to be determined. for estimation of n, either some information about the leak opening is necessary or networ...

1) Minimum Water Surface Area .........................................................................................................................11 2) Pond Live Storage ...........................................................................................................................................11 3) Primary Water Quality Outlet Devices ...........................................

CH4, C2H6 and C2H4 are the most important outlet gaseous of oxidative couple methane (OCM) reaction and this process is a new technology for conversion of natural gas to ethane and ethylene products. In this study, adsorption of OCM outlet hydrocarbons over 10X zeolite has been examined at equilibrium conditions. Temperature and pressure are the most effective operational parameters in the batc...

Tip vortex cavitation is one of well known patterns of cavitation phenomenon which occurs in axial pumps. This pattern of cavitation occurs due to pressure difference between the pressure and suction sides of blades of an axial pump. Since the pressure in the pressure side of the blade is higher than the pressure in its suction side, thus a very small portion of liquid flow flows back from pres...

in this study, mixed convection heat transfer and local and global entropy generation in aventilated square cavity have been investigated numerically. the natural convection effect isachieved by a constant heat flux imposed at the bottom wall and cooled by injecting a coldfollow. in order to investigate the effect of port location, four different placementconfigurations of the inlet and outlet ...

PURPOSE We investigated the relationship between ultrasound estimated bladder weight/corrected ultrasound estimated bladder weight and the bladder outlet obstruction index derived from pressure flow study to evaluate its diagnostic efficacy to predict bladder outlet obstruction. MATERIALS AND METHODS A total 193 men older than 50 years with lower urinary tract symptoms were enrolled in this s...

The study of the performance dynamic hydraulic throttling under condition stable fluid is great significance. effect a step change in pressure differences on valve studied. This paper studies and static hydraulic-valve-outlet throttling-speed regulation system, builds more accurate mathematical model, considers linear factors flow hydraulic-valve throttling, analyzes influence step-load differe...

The most critical problems of electronic components are the high power consumption and lesser life. This paper aims to numerically model working process water-cooled heat sink obtain effective design. In this context, four types configurations with different passes (Type-A, Type-B, Type-C, Type-D) were designed at water velocities, which 0.25 m/s, 0.5 1 m/s constant air velocity (6 m/s) simulat...

This paper presents numerical analysis of the hydrodynamic flow focusing in rectangular microchannels. The low Reynolds number pressure driven flow in symmetric system of crossed channels with three inlets and one outlet is investigated. The numerical model is used to elucidate the origin of broadening of the focused flow sheet observed experimentally close to the side walls of the outlet chann...