Prediction of the transient force subsequent to a liquid mass impact on an elbow of an initially voided line

Download

index.pdf

Date

2009

Author

Kayhan, Bülent Abbas

Metadata

Show full item record

Item Usage Stats

141
views

96
downloads

The aim of the thesis, is to find the transient force applied by an individual transient liquid slug on an elbow at the end of a horizontal line due to an impact. The liquid slug is driven by pressurized air in a tank located upstream of the pipeline. The time dependent pressure distribution along the elbow and a vertical extension segment after the elbow was solved, with a 1-D numerical approach along a curved line mesh. For this purpose; firstly, a 3-D axial turbulent velocity profile function was assumed for the slug, with its shape allowed to sway towards the convex side of the elbow along the curved mesh with the aid of a calibration tool. Then, the pressure values were calculated by using 1-D application of Reynolds Equations in cylindrical polar and cartesian coordinates for the elbow and the vertical extension segment, respectively. The transient force acting on the elbow and the following vertical extension segment was found by using these calculated pressure values and applying conservation of momentum principle over the volume elements selected along the elbow and the vertical extension segment. For the analysis of the slug motion from the pressurizer tank to the elbow, a previously written computer code BOZKUŞ-2 was utilized. Then, the elbow and the vertical extension segment calculations in this study were made with a new code KAYHAN, which is an improved version of BOZKUŞ-2. The calculated transient force and impact pressures at the elbow were also compared with those from previous studies.

Subject Keywords

Civil engineering., Liquids, Kinetic theory of.

URI

http://etd.lib.metu.edu.tr/upload/12610489/index.pdf
https://hdl.handle.net/11511/18794

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

A New Method for Prediction of the Transient Force Generated by a Liquid Slug Impact on an Elbow of an Initially Voided Line KAYHAN, Bulent A.; Bozkuş, Zafer (ASME International, 2011-04-01) The aim of the present study is to predict the impact force applied by an individual transient liquid slug on an elbow at the end of a horizontal and initially empty pipeline. The liquid slug is driven by pressurized air in a tank located upstream of the pipeline. The time dependent pressure distribution along the elbow and a vertical extension segment after the elbow are solved with a 1D numerical approach along a curved line mesh. An assumed and calibrated axial turbulent velocity profile function with 3D...
Test method for appraising future durability of new concrete bridge decks Yaman, İsmail Özgür; Aktan, H.M.; Hearn, N.; Staton, J.F. (SAGE Publications, 2002-01-01) The nondestructive test procedure for quantifying the future durability of bridge deck concrete is based on the fundamental relationship between ultrasonic pulse velocity (UPV) and the permeability of an elastic medium. An experimental study using standard concrete cylindrical specimens (ASTM C192) documented adequate sensitivity between UPV and permeability. The test procedure uses a parameter directly proportional to increase in-field concrete permeability called paste quality loss (PQL). The PQL is compu...
Prediction of damage in R/C shear panels subjected to reversed cyclic loading Hindi, R; Mansour, M; Dicleli, Murat (Informa UK Limited, 2005-01-01) In this paper, the damage prediction of shear-dominated reinforced concrete (RC) elements subjected to reversed cyclic shear is presented using an existing damage model. The damage model is primarily based on the monotonic energy dissipating capacity of structural elements before and after the application of reversed cyclic loading. Therefore, it could be universally applicable to different types of structural members, including shear-dominated RC members. The applicability of the damage model to shear-domi...
Determination of rough surface contact stiffness coefficient Yıldırım, Emine Gülşah; Akkök, Metin; Department of Mechanical Engineering (2017) In this thesis, the resistance against deformation under the effect of loading, which is simply called as stiffness, is investigated for the contacting bodies. The contact stiffness at mixed lubrication regime is tried to be found for line contact. Because of the mixed lubrication regime, the overall contact stiffness is investigated in two major parts as asperity stiffness and oil film stiffness which are considered to be connected in parallel in a spring model. Also, overall stiffness is calculated by reg...
Dynamic Force on an Elbow Caused by a Traveling Liquid Slug Hou, Darcy Q.; TIJSSELING, Arris S.; Bozkuş, Zafer (ASME International, 2014-06-01) The impact force on an elbow induced by traveling isolated liquid slugs in a horizontal pipeline is studied. A literature review reveals that the force on the elbow is mainly due to momentum transfer in changing the fluid flow direction around the elbow. Therefore, to accurately calculate the magnitude and duration of the impact force, the slug arrival velocity at the elbow needs to be well predicted. The hydrodynamic behavior of the slug passing through the elbow needs to be properly modeled too. A combina...

Citation Formats

B. A. Kayhan, “Prediction of the transient force subsequent to a liquid mass impact on an elbow of an initially voided line,” Ph.D. - Doctoral Program, Middle East Technical University, 2009.