vibration effects of two-phase cross flow on heat

Influence of vibration in enhancement of heat transfer

The effects of bundle geometry on heat exchanger tube vibration in two-phase cross flow were found experimentally by Pettigrew et al. []. The experiments were done on tube bundles of different geometries subjected to two-phase cross flow at angles of (30, 60 and 90).

Vibration of a Tube Bundle in Two

Two-phase cross-flow exists in many shell-and-tube heat exchangers. The U-bend region of nuclear steam generators is a prime example. Testing in two-phase flow simulated by air-water provides useful results inexpensively. However, two-phase flow parameters, in

Vibration in nuclear plant Volume 1

Avoid Vibration Damage in Heat Exchangers. Presentation and Discussion. 134 1.9 (Log No. 68) Flow Induced Vibration of Tube Bundles in 135 Two-phase Cross-flow. Presentation and Discussion. 161 1.10 (Log No. 71) Calculation of the Response of Heat II

Experimental Investigations of Vibrations Induced by Cross

Cross-flow, Vibrations induced by cross -flow, Bundle of tubes, rotated triangular, Shell and tube type heat exchangers, PVC tubes A B S T R A C T Experimental investigations of vibrations induced by cross-flow in a tube bundle have been carried out in this

Two

In fluid mechanics, two-phase flow is a flow of gas and liquid — a particular example of multiphase flow.Two-phase flow can occur in various forms, such as flows transitioning from pure liquid to vapor as a result of external heating, separated flows, and dispersed two-phase flows where one phase is present in the form of particles, droplets, or bubbles in a continuous carrier phase (i.e

Internal Fluid Flow Induced Vibration of Pipes

The flow induced vibration of pipes due to internal flowing fluid is studied and investigated. Equations were developed to express the influence of internal fluid flow on the natural frequency and displacement amplitude of vibrating pipes. The approach involved complex mechanics and geometric analysis to arrive at new and simple equations which compares favorably to experimental results. The

Effect of Fin Geometry on Flow

vibration subjected to air cross-flow in a tube array. In the current study, some of these parameters i.e. fin thickness and fin density are focused and their effects on flow-induced vibration response are analyzed in different rows of fin tube array. The current

AUGMENTATION OF HEAT TRANSFER, SINGLE PHASE

Surface vibration has been demonstrated to improve heat transfer to both laminar and turbulent duct flow of liquids. The largest improvements (up to 200%) are observed with laminar or transitional flow utilizing a concentric-tube heat exchanger with the inner tube vibrated transversely or a rectangular channel with a flexible, vibrating side.

Slug Flow and Slug Flow Analysis – What Is Piping

Slug Flow is a typical two-phase flow where a wave is picked up periodically by the rapidly moving gas to form a frothy slug, which passes along the pipe at a greater velocity than the average liquid velocity. slugs can cause severe and dangerous vibrations in

Two

In fluid mechanics, two-phase flow is a flow of gas and liquid — a particular example of multiphase flow.Two-phase flow can occur in various forms, such as flows transitioning from pure liquid to vapor as a result of external heating, separated flows, and dispersed two-phase flows where one phase is present in the form of particles, droplets, or bubbles in a continuous carrier phase (i.e

Fluids

The cross-flow over a surface-mounted elastic plate and its vibratory response are studied as a fundamental two-dimensional configuration to gain physical insight into the interaction of viscous flow with flexible structures. The governing equations are numerically solved on a deforming mesh using an arbitrary Lagrangian-Eulerian finite-element method. The turbulent flow is resolved using the

Effect of Void Fraction on Vibrational Behavior of Tubes in

The effects of local two-phase flow parameters on the vibrational behavior of tubes have been studied in an in-line 5 20 tube bundle subjected to air-water cross-flow. One of the tubes was flexibly mounted and instrumented for vibration measurement and the others

Differentiating Between Acoustic and Flow

Acoustic-induced vibration (AIV) and flow-induced vibration (FIV) are phenomena that have been used interchangeably in to provide a better understanding of the two types of vibrations and their effects on piping systems. This paper identifies options. The two

Influence of vibration in enhancement of heat transfer

Influence of vibration in enhancement of heat transfer rates from thin plannar fins Influence of vibration in enhancement of heat transfer rates from thin plannar fins Eid, E.; Gomaa, M. 2008-12-20 00:00:00 The enhancement of heat transfer rates without an extension of heat removal surface area due to packaging and compactness is essential.

Vibration in nuclear plant Volume 1

Avoid Vibration Damage in Heat Exchangers. Presentation and Discussion. 134 1.9 (Log No. 68) Flow Induced Vibration of Tube Bundles in 135 Two-phase Cross-flow. Presentation and Discussion. 161 1.10 (Log No. 71) Calculation of the Response of Heat II

VIBRATION ANALYSIS OF HEAT EXCHANGER USING CFD

film damping, two phase damping, support damping. The dynamic stiffness and support effectiveness is derived. The other important parameter in vibration in heat exchanger is fluid elastic instability which is derived for single phase flow and two 3. -Part 2:

Vibration in nuclear plant Volume 1

Avoid Vibration Damage in Heat Exchangers. Presentation and Discussion. 134 1.9 (Log No. 68) Flow Induced Vibration of Tube Bundles in 135 Two-phase Cross-flow. Presentation and Discussion. 161 1.10 (Log No. 71) Calculation of the Response of Heat II

Effects of Mechanical Vibration on Critical Heat Flux in

Effects of Mechanical Vibration on Critical Heat Flux in Vertical Annulus Tube 2007 - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Scribd es red social de lectura y publicacin ms importante del mundo.

Free vibrations of two tandem elastically mounted

Free vibrations of two tandem elastically mounted cylinders in crossflow - Volume 861 - Bin Qin, Md. Mahbub Alam, Yu Zhou We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to

UNSTEADY MOMENTUM FLUXES IN TWO

case of single-phase flow the structural vibration in cross flow is excited by the well-known vortex sheding; in parallel flow, either internal or external, the turbulence in the flow stream may be the excitation source. In the case of two-phase flow, the unsteady com

Influence of vibration in enhancement of heat transfer

The effects of bundle geometry on heat exchanger tube vibration in two-phase cross flow were found experimentally by Pettigrew et al. []. The experiments were done on tube bundles of different geometries subjected to two-phase cross flow at angles of (30, 60 and 90).

VIBRATION ANALYSIS OF HEAT EXCHANGER USING CFD

film damping, two phase damping, support damping. The dynamic stiffness and support effectiveness is derived. The other important parameter in vibration in heat exchanger is fluid elastic instability which is derived for single phase flow and two 3. -Part 2:

The Effects of Cross Links on Adiabatic Two

Dang, MN, Hassan, IG. The Effects of Cross Links on Adiabatic Two-Phase Flow Characteristics in Scaled Microchannel Heat Sinks. Proceedings of the ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels.ASME 5th

The Effect of Vibration on Critical Heat Flux in a Vertical Round

The Effect of Vibration on Critical Heat Flux 735 III. Experiments 1. Test Loop The test loop consists of a round tube-type test section, a main condenser, a displacement pump, a surge tank, a turbine flow meter, some valves and two preheaters ( Fig. 1). Each part

Direct Numerical Simulation of Two Phase Flows in Liquid

Sander, W, Weigand, B, Beerens, C. Direct Numerical Simulation of Two Phase Flows in Liquid Cooled Engine Valves. Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems .

A Survey on Vortex Induced Vibration of Cross Flow Heat

E. Longatte et al. [12] studied the numerical methods for investigating the effects of flow induced vibration on the tube bundle motion in presence of fluid at rest and single phase cross-flows. They used arbitrary Langrange Euler formulation for the fluid computation for simulating thermo-hydraulics and mechanics problem.

Thermalhydraulic Analysis of Steam Generators:

Flow-induced vibration concerns may be avoided by analysis, which requires the knowledge of flow patterns and the flow distribution in steam generators (SG). Typically, the distributions of flow velocity, fluid density, and, in the case of two-phase flow, distributions of

Slug Flow and Slug Flow Analysis – What Is Piping

Slug Flow is a typical two-phase flow where a wave is picked up periodically by the rapidly moving gas to form a frothy slug, which passes along the pipe at a greater velocity than the average liquid velocity. slugs can cause severe and dangerous vibrations in

New Experimental Data and Analysis for Two

In the past, fluid-elastic instability in two-phase flow has been largely investigated with air-water flow. In this work, new experiments are conducted in air-water cross-flow with a fully flexible 5 3 normal square array having pitch-to-diameter ratio of 1.4.

Study of Fluid Induced Vibrations using Simulation Means and their Effects

In recent years, two-phase flow induced vibration (FIV) has been given increasing attention in various engineering fields including petroleum pipelines, power and processing plants, heat exchangers, as well as in the nuclear power plant components. In these

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