The present work describes the development of a pulsed photoacoustic (PA) flowmeter. An acoustic wave in a flowing fluid is produced by absorption of a laser pulse focused over a path flow line. The acoustic propagations, along and against the flow, are monitored by two cw probe beams. In the interaction, the probe beam undergoes a transient deflection that is detected by a fast response photod...

Advanced accelerator-based radiographic diagnostics require multiple high-current electron beam pulses for temporal resolution. The use of “kicked” beams or the failure of a transport element on a prior pulse can result in the production of a plasma plume from locations where the beam sweeps across the beam pipe, due to high thermal deposition by the beam. It is possible for this plasma to evol...

Based on the small deflection beam theory, bending equation with axial tension of suspended pipe partially buried in the linear elastic soil is established. And the corresponding boundary conditions are given according to the stress and deformation characteristics of suspended section and buried section. Then deflection equation for the suspended section is deduced. Afterwards, the stress and c...

1st of november 2005 2 Contents 1 Introduction 1 2 Estimation of temperature gradients in laminar flow through a cylindrical pipe-the assumption of a linear change in wall temperature with axial distance 1 2.1 Temperature distribution in a pipe with circular cross-section assuming a linear wall temperature variation with distance. .. .. 2 3 A ray-tracing analysis of the flow-meter error in the ...

For older water pipeline materials such as cast iron and asbestos cement, future pipe failure rates can be extrapolated from large volumes of existing historical failure data held by water utilities. However, for newer pipeline materials such as polyvinyl chloride (PVC), only limited failure data exists and confident forecasts of future pipe failures cannot be made from historical data alone. T...

This study presents a spiral pipeline robot designed for detecting and preventing oil gas leakages. A comprehensive analysis of factors such as angle, normal force, pipe material, operating attitude is conducted based on the robot’s mechanical model in straight pipe. in-depth investigation determines optimal to enhance motion stability traction performance. Using virtual prototype technology, p...

The shape of the liquid-vapor interface along length adiabatic section a heat pipe - passive transfer device that relies on capillary pumping is investigated to identify mechanisms behind both performance enhancement techniques as well operational failure. In formulating associated mathematical model, liquid flow within (screen type) wick described using Darcy’s law while Poiseuille’s equation ...