Effect of pipematerials on water hammer

Kandil, M.; Kamal, A.M.; El-Sayed, T.A.

doi:10.1016/j.ijpvp.2019.103996

Cited by 35 publications

(11 citation statements)

References 6 publications

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“…where υ is the Poisson's ratio. Rearranging Equation (20) and considering experimental values for G 1C = (1.27 ± 0.09) kJ m À2 and E Y = (3015 ± 28) MPa, and assuming for U-PVC υ = (0.40 ± 0.01), [42][43][44] it is possible to estimate K 1C = (2.13 ± 0.08) MPa m 1/2 . This estimated value is in good agreement with previously published results for U-PVC.…”

Section: Plane Strain Energy Release Rate (G 1c )mentioning

confidence: 99%

Application of fracture mechanics for the characterization of poly(vinyl chloride) pipes. II. Evaluation of a ring‐type specimen for fracture mechanics testing

Rodolfo

John

2021

Vinyl Additive Technology

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An unplasticized poly(vinyl chloride) (U-PVC) pipe sample used in infrastructure applications in Brazil (nominal diameter DN 100, outside diameter 110 mm) was evaluated according to different fracture mechanics methodologies, including essential work of fracture (EWF) and other fracture toughness parameters such as the stress intensity factor K C and plane strain energy release rate G 1C . This pipe sample was also tested for the quality of processing (degree of gelation) via differential scanning calorimetry (DSC) and tensile strength. The comparative evaluation of different specimen configurationscurved specimens in three-point bending (CTPB) and full rings in tension (SNRT), in thicknesses varying from 5 to 30 mm, showed initial evidence of the suitability of ring-type specimens for the evaluation of EWF and K C . Results also indicate that the full ring geometry, at least in the present experimental setup, presents some drawbacks probably due to the storage of large amounts of elastic energy throughout the test. This fact leads to relevant deviations in both load-displacement behavior and results for strain energy release rate (J C ), and the results found here will guide future research using full and split rings in different loading modes and improved experimental setups. It

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Section: Plane Strain Energy Release Rate (G 1c )mentioning

confidence: 99%

Application of fracture mechanics for the characterization of poly(vinyl chloride) pipes. II. Evaluation of a ring‐type specimen for fracture mechanics testing

Rodolfo

John

2021

Vinyl Additive Technology

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“…The experimental set up for hydraulic transient test was designed and fabricated in the Department of Hydro and Renewable Energy at Indian Institute of Technology Roorkee. The experimental set up consist of two straight pipelines with different materials, a butterfly valve (7) mounted on the downside of the pipeline, an air vessel (5) and pressure sensors (10). The water hammer experiments were carried out for metallic (MS) and viscoelastic (GRP) pipeline.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…The analysis of hydraulic transient is essential for the selection of penstock material, its pressure class and the specifications of surge protection devices. Formation of hydraulic transient in penstock is greatly influenced by its material [6,7]. More rigid material means higher transient formation and elastic materials forms lower transient waves.…”

Section: Introductionmentioning

confidence: 99%

“…The water supply was given to the experimental setup from the reservoir (8) by a centrifugal pump(1). The butterfly valve(7) was operated by pneumatic actuator. The valve closure time C t , was calculated as 0.06 s. The pressure was measured with the help of five pressure sensors connected with a DAQ system (10), located at equi-distance on the test section of the pipe.…”

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confidence: 99%

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Analysis of wave damping in pipeline having different pipe materials configuration under water hammer conditions

Garg

Kumar

Abbas³

2021

Preprint

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Hydraulic transient occurs whenever there is a sudden change in the flow velocity resulting in variation of pressure and flow in a water conductor system . Experiments have been conducted in a straight pipeline having material of Mild Steel (MS) and Glass Fibre Reinforced Plastic (GRP) pipelines and their combined configurations. From experiments, it has been observed that there is a smooth and strong damping of pressure waves in the pipeline system. Experimental results were compared with results obtained for classical water hammer equations solved in MATLAB and analyzed that there are several dissipative factors, other than fluid viscosity, responsible for strong damping of pressure wave amplitude. Further, an improvement in the governing equation of water hammer in a closed conduit was proposed by incorporating a different wave damping coefficient (a). The modified governing equations have been solved for each water hammer cycle using MATLAB. The numerical simulation results show that proposed approach gives better agreements between the experimental and computational results for all investigated cases.

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“…The distribution and amplitude of the pressure wave front depend on the roughness of the pipeline, blockages due to sediment deposition, corrosion, etc. [1]. Recorded pressures are a tool for estimating driving conditions after studying pressure damping models.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Non-Newtonian Fluid Behavior and Coefficient of Friction in Water Hammer Phenomena

Achak

Rkibi

Bahrar³

et al. 2021

ARFMTS

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An unstable flow of non-Newtonian fluid, with friction in a pipe is studied, describing the water hammer phenomenon. The equations of the problem are given, then solved by a numerical approach. The non-Newtonian behavior of the fluid, as well as the effect of the coefficient of friction which represents an additional mechanism of energy dissipation are investigated. The 1D and 2D problem is used simultaneously, based on the Runge-kutta method for the descritization in time, Finite differences, Characteristics for the descritization in space. The results of this article show by verifying with experience that these methods used, in addition to being simple, are also effective and give reasonable results.

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Effect of pipematerials on water hammer

Cited by 35 publications

References 6 publications

Application of fracture mechanics for the characterization of poly(vinyl chloride) pipes. II. Evaluation of a ring‐type specimen for fracture mechanics testing

Application of fracture mechanics for the characterization of poly(vinyl chloride) pipes. II. Evaluation of a ring‐type specimen for fracture mechanics testing

Analysis of wave damping in pipeline having different pipe materials configuration under water hammer conditions

Investigation of Non-Newtonian Fluid Behavior and Coefficient of Friction in Water Hammer Phenomena

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