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Wednesday, October 14, 2020 | History

2 edition of Pulsating flow in pipes. found in the catalog.

Pulsating flow in pipes.

D A. Nellist

Pulsating flow in pipes.

by D A. Nellist

  • 362 Want to read
  • 23 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D.thesis.Typescript.

SeriesTheses
The Physical Object
Pagination1vol
ID Numbers
Open LibraryOL13694639M

It contains 23 invited chapters from international specialists on the topics of numerical modeling of pulsating heat pipes and of slug flows with evaporation; lattice Boltzmann modeling of pool boiling; fundamentals of boiling in microchannels and microfin tubes, CO2 and nanofluids; testing and modeling of micro-two-phase cooling systems for electronics; and various special topics (flow separation in .   So far I tried to simulate my very long (l/D=) channel with a constant wall temperature, pulsating velocity and oscillatory temperature BC at the inlet. I introduced a special turbulence Model (Wang & Zhang: "Numerical analysis of heat transfer in pulsating turbulent flow in a pipe", Heat and Mass Transfer, ) containing wallfunctions.

  Experimental study of pulsating turbulent flow through a divergent tube, in Matos, D. and Valerio, C. ed., Fluid Mechanics and Pipe Flow, Chap Nova Science Pub. Nabavi, M. and Siddiqui, K. (). A critical review on advanced velocity measurement techniques in pulsating flows, Measurement Science and Technology, Vol. 21, (19pp). Subsequent chapters focus on the measurement of incompressible flow in pipes by pitot and static traverse methods; methods of flow measurement based upon the rates of cooling of hot bodies; and the measurement of pulsating flow. This book is intended for students and engineers and for other practitioners concerned with the measurement of the.

Another key point was the turbine response during pulsating flow at the different rotor speed. Parameter such as the turbine total-static efficiency under the single-pressure pulse was investigated. Also, the exhaust pipes were studied to check its filling-emptying behavior. The article is divided into three parts. Dynamic analysis of supported pipes conveying pulsating fluid is investigated in Hamiltonian system using precise integration method (PIM). First, symplectic canonical equations of supported pipes are deduced with state variable vectors composed of displacement and momentum. Then, PIM with linear interpolation formula is proposed to solve these equations. Finally, this approach's precision.


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Pulsating flow in pipes by D A. Nellist Download PDF EPUB FB2

Turbulent and laminar pulsating flows in a straight smooth pipe are compared at identical frequencies and Reynolds numbers. Most measurements were made at a mean Reynolds number ofbut the.

Shemer, L. & Kit, E. An experimental investigation of the quasi-steady turbulent pulsating flow in a pipe. Phys. Flu 72 – Cited by: Tests on pulsating flow through straight pipes are reported.

Investigations also cover instantaneous flow states and friction conditions of the turbulent. Subsequent chapters focus on the measurement of incompressible flow in pipes by pitot and static traverse methods; methods of flow measurement based upon the rates of cooling of hot bodies; and the.

developed, pulsating pipe flows, where the mass flow rate, rather than the pressure gradient is pre-scribed as a periodic function of time.

The momen-tum equation, governing the transient, fully-developed pulsating flow of an incompressible fluid through a circular duct has been considered. Turbu. cycle pulsating flow was generated by superimposing an oscillating flow driven by a piston installed in a scotch yoke mechanism on a steady flow supplied by a pump.

Thus, the instantaneous axial velocity averaged over the cross section, W. a, can be expressed in the form 𝑊. 𝑎 =, 𝑎 + 𝑠𝑖𝑛 (1) Here, (= t.

Pulsating turbulent pipe flow in the current dominated regime at high and very-high frequencies International Journal of Heat and Fluid Flow, Vol. 58 Erratum to: Quantitative Assessment of Turbulence and Flow Eccentricity in an Aortic Coarctation: Impact of Virtual Interventions.

Systematic errors caused by a pulsating flow can be positive or negative and are in general related to flow or velocity pulsation amplitude and frequency. In contrast to the criterion of pressure pulsation as specified in API for pipe systems in relation to pulsation forces, the flow or velocity pulsation.

TO PULSATING HEAT PIPES Prafull V Shahare1* and K K Jain1 *Corresponding Author: Prafull V Shahare, [email protected] pulsating (or oscillating) heat pipes (PHP or OHP) are new two-phase heat transfer devices that rely on the oscillatory flow of liquid slug and vapor plug in a long miniature tube bent into many turns.

The solution is derived from 3 basic assumptions: 1) Newton's fundamental law of motion, i.e. \(\textbf{F} = m \textbf{a}\) (force = mass times acceleration); 2) a geometric assumption about the nature of the flow, i.e. a circular cross-sectional geometry in which the fluid elements flow straight down the tube and that the flow is fully.

Supplementary Notes Translation of: Pulsierender Durchflussdurch Rohre Source: Focschung, Vol. ll f No. 4,pp. Abstract Pulsating flow through pipes; test on straight pipe, flow through which is pulsating, to investigate instantaneous state of flow ant friction of turbulent friction layer in case of non-stationary flow.

Pulsatile viscous flow in a curved pipe: Effects of pulsation on the development of secondary flow. International Journal of Heat and Fluid Flow, Vol. 31, Issue. 5, p. Characteristics of oscillating flow in a micro pulsating heat pipe: Fundamental-mode oscillation International Journal of Heat and Mass Transfer, Vol.

Experimental and theoretical research on a ammonia pulsating heat pipe: New full visualization of flow pattern and operating mechanism study. Flow-Induced Pulsation and Vibration in Hydroelectric Machinery Engineers Guidebook for Planning, Design and Troubleshooting. bygir 0 Comment. TNO Science and.

Abstract. This paper presents a measurement process based on a test rig for investigating pulsating flow in pipes, with the possibility of changing several key parameters: temperature, closed end nozzle diameter, mass flow rate and pulsation frequencies or orifice plate rate.

A two-dimensional oscillating flow analysis was conducted simulating the gas flow inside Stirling engine heat exchangers. Both laminar and turbulent oscillating pipe flow were investigated numerically for Re max = 1, (Va = 80), 10, (Va = ), 19, (Va = ), (Va = ).

The results are here compared with experimental results of previous investigators. Oscillating heat pipes (OHP), also referred to as pulsating heat pipes (PHP), are a relatively new development in the field of heat pipe technology.

Originally developed and patented by Hisateru Akachi inOHPs consist of a long meandering tube which is heated and cooled at.

The transitional regime of a sinusoidal pulsatile flow in a straight, rigid pipe is investigated using particle image velocimetry. The main aim is to investigate how the critical Reynolds number is affected by different pulsatile conditions, expressed as the Womersley number and the oscillatory Reynolds number.

The transition occurs in the region of Re = and is characterized by an. To find the relation between the flow pattern throughout the exhaust pipe and exhaust noise, a pulsating flow through a pipe with and without a nozzle, the area ratio of the nozzle to the pipe beingwas experimentally examined.

The pulsating flow was generated by the rotary valve. Abstract Pulsating turbulent flows effects on cleaning in place procedure of straight pipes were investigated for various pulsations parameters (frequency and amplitude) and mean velocities of the. Pulsating Noise from Pipes I have a customer with an unexplained sound of pulsating pipes, but it does not happen all the time, and seems to happen mostly early evening.

I ran all the fixtures in the house, could not make the noise happen again, checked the water meter.A pulsatile laminar flow of a viscous, incompressible fluid through a pipe with a sudden constriction (an orifice) was simulated by an immersed-boundary method.

A fluid is forced to move by an imposed sinusoidally varying pressure difference, Δ p t.This book is an essential resource and learning tool for senior undergraduate, graduate students, practicing engineers, researchers, and scientists working in the area of heat pipes.

This book also Includes detailed descriptions on how an oscillating heat pipe is fabricated, tested, and utilized.