Pressure wave attenuation in an air pipe flow

Abstract

Pressure wave transmission attenuation in an air pipe¯ow is investigated both theoretically and experimentally. This investigation is to ensure the viability of remote¯ow measurement in an air pipe¯ow using a new¯uidic pressure-pulse-transmitting¯owmeter. The novel¯owmeter produces self-induced oscillations, whose frequency is proportional to the¯owrate. These pressure waves are transmitted via the¯owing¯uid and can be detected far downstream of the device. Experimental work has been conducted to ascertain how much the pressure waves are attenuated in air¯ow in a pipeline. This was done by using pipes of 0.05 m diameter and both 4.7 and 28.5 m long installed downstream of the¯owmeter. A method of network simulation known as transmission line modelling (TLM), which has been programmed as the Sheeld University Network Analysis Software (SUNAS) code, is described and utilized to predict the wave decay through the air pipe¯ow. The theoretical and experimental results were found to give good agreement, demonstrating both the value of the modelling software and the viability of the remote¯ow measurement concept.

Propagation of Measurement-While-Drilling Mud Pulse during High Temperature Deep Well Drilling Operations

“…Understanding the propagation and attenuation characteristics of mud pulse in drill string still needs strong theories to be formulated together with reliable smart experiments. The prime factor which opposes any pressure wave propagation is the irreversibility of the process associated with friction [5]. Therefore, wall shear stresses and molecular interactions between adjacent flow layers have to be accurately quantified.…”

“…Stuckenbruck et al [39] gave numerical results of an improved analysis of wave speed. Pressure wave transmission attenuation in a pipe flow was investigated both theoretically and experimentally by Wang et al [5]. Sato and Kanki [40,41] obtained the analytical solutions for the compression wave and steady state oscillating flow in a pipe with a circular cross-section.…”