Water velocity

The model was applied to the study long wave propagation on uneven bathymetries, after that, compared with analytical solutions or published numerical ones to understand more about the interaction processes between the long wave and sea beach or island in terms of water and velocity profiles. Very good agreement is observed in the figures bellow, showing good application prospect.

3p vicaptainmarvel 21-04-2023 7 4   Download

In this paper, SWAN model was used to calculate and discuss the spatial variation of bed shear stress, taking into consideration the effects of wind velocity and direction at Cam Ranh bay and Thuy Trieu lagoon.

8p vipagani 24-10-2022 11 2   Download

(BQ) Ebook Handbook of hydraulics for the solution of hydraulic engineering problems (Seventh edition): Part 1 presents the following content: Chapter 8: open channels with non-uniform flow; chapter 9: high-velocity transitions; chapter 10: wave motion and forces; chapter 11: spatially variable and unsteady flow; chapter 12: measurement of flowing water; chapter 13: advances in hydraulics using computer technology; chapter 14: applicable computer programs.

178p runordie6 10-08-2022 5 1   Download

This study aims to use FA and GGBFS to replace 50% cement in the production of LFC. Various PP fiber contents were also incorporated to enhance the mechanical strength of LFC. Then, the influence of PP fiber content on the engineering properties of LFC was investigated in terms of fresh unit weight (UW), dry density, water absorption, thermal conductivity, flexural strength, compressive strength, and ultrasonic pulse velocity (UPV).

12p haoasakura 30-05-2022 23 1   Download

Drag reduction in fully developed turbulent pipe flow with 4 concentrations (200 to 500 wppm or mg/kg) of low molecular weight sodium carboxymethylcellulose (CMC) in aqueous solutions was investigated experimentally. Drag reduction was determined by pressure drop measurements. Maximum drag reduction achieved was 22% using 500 wppm CMC solution. To observe the impact of the presence of CMC on the flow, ultrasound Doppler velocimetry (UDV) was employed to monitor the instantaneous velocity distributions.

10p langthannam 29-12-2021 7 0   Download

This paper presents the research results of theoretical model and numerical model of the washed-out process of alkylphenols in the late stage of water injection. The research results have proposed approximate analytical expression for concentration of alkylphenols at the late stage of water flooding. In this regard, at the sufficient large injection volume the alkylphenol concentration attenuates exponentially and the attenuation rate depends on parameters such as partitioning coefficient, oil saturation and interstitial velocity of water and oil and diffusion coefficients.

6p trinhthamhodang1220 21-07-2021 8 1   Download

In order to reduce the serious impacts of industrial and agricultural wastes on the environment, raw rice husk and bottom ash were used as fine aggregates, while fly ash was utilized as a binder material in the production of unburnt building bricks. Two group mixtures were designed with water-to-binder (W/B) ratios of 0.30 and 0.35. The rice husk was used to replace 0%, 3%, 6%, and 9% of bottom ash content by mass.

11p chauchaungayxua12 09-07-2021 10 2   Download

This study addresses, to some extent, the effect of the seeding-particle concentration on the results of spike-excitation UVP measurements. For the investigation, experimental measurements of water pipe flow have been carefully executed for a wide range of the particle concentration. The dependence of the measured data on the particle concentration is evaluated and reported. The result of this study suggests an appropriate range of the seeding-particle concentration in setting up spike-excitation UVP measurements.

12p nguaconbaynhay11 07-04-2021 12 2   Download

In order to investigate hydrodynamic phenomena in two-phase flow conditions in nuclear safety analysis, a series of two-phase flow experiments were conducted using a single flow channel in which air and water were simultaneously injected into the test section. The experiments under atmospheric pressure conditions were carried out with the water velocity and the air velocity covering the ranges from 0.2 to 1.5 m/s and 0.05 to 0.2 m/s, respectively.

11p trinhthamhodang1218 14-03-2021 4 1   Download

Numerical models that calculate bed change are becoming increasingly popular because of their longterm forecast projections and their ability to identify causes of bed change. However, the reliability of the simulation results depends on the length of the data series and the algorithms in the model, in which the boundary condition method plays a critical role. The aim of this study is to assess the effectiveness of the HYDIST model to update wet and dry fronts as well as recalculate the wet boundaries of the hydraulic model before its input into the sediment transport model.

11p nguaconbaynhay10 29-01-2021 12 1   Download

In this work, the auto-correlation function of center of mass velocity has been used to deduce the mass diffusion coefficient (D) of water diluted in nitrogen using the Classical Molecular Dynamics Simulations (CMDS). The calculations have been performed at room temperature (296 K) for different mixtures of H2O in N2 and for 2.107 molecules from a five-sites potential.

7p koxih_kothogmih5 04-09-2020 22 2   Download

Testing of agricultural sprinklers is necessary to find the optimum field operating conditions with minimum cost while satisfying design water distribution criteria. In the present study two twin-nozzle agricultural sprinklers were tested in field under ten different operating pressures ranging from 1.6 kg/cm² to 3.5 kg/cm². In each experiment sprinkler discharge rate, nozzle pressure, radius of throw, and water distribution pattern around the sprinkler were observed. The average discharge coefficients of the two sprinkler nozzles were determined.

12p angicungduoc6 22-07-2020 10 3   Download

The present work aims at improving our understanding of nefarious reorganisation phenomena observed by numerous studies in the flow large-scale structures. 3D simulations allowed identifying two distinct reorganisations consisting in a sign change for either a transverse velocity in rod-to-rod gaps or for a subchannel vortex.

7p christabelhuynh 29-05-2020 9 0   Download

Evaporative cooling system is one of the cooling techniques, but the limitation is that cooling can be done up to wet bulb temperature only, so a study has been taken up to design, develop a two-stage evaporative cooling system. Cooling performance of twostage indirect/direct evaporative cooling system was experimentally investigated. For this purpose, a two-stage evaporative cooling experimental setup consisting of an indirect cooling stage (IDC) followed by a direct evaporative cooling stage (DEC) was designed, constructed and tested.

7p kequaidan2 11-12-2019 38 1   Download

Four different concentrations (10.0 ppm; 20.0 ppm; 40.0 ppm and 50.0 ppm) of the aqueous solution of seed powder of Syzigium cumini (L) concentrations was used to treat the leaves of mulberry and fed to the fifth instar larvae of bivoltine, crossbreed silkworm, Bombyx mori (L) Race: Bivoltine Cross Breed [(CSR6 x CSR26) x CSR2 x CSR27)] for first four days of fifth instar larvae. The larvae fed with untreated and water treated leaves were also maintained. The midgut enzyme (protease and amylase) bioassays were carried out on fifth day.

12p nguaconbaynhay1 04-12-2019 15 1   Download

This paper presents an experimental study of adhesive and rheological properties of cement mortars proportioned with various contents of a water-soluble polymer admixture. To determine the adhesive properties the probe tack test was used. The results have been exploited to identify the adhesion strength, the cohesion strength and the support’ adherence force. It is found that the cohesion component displays a minimum when varying the polymer content. The behavior of the adherence force is more complex.

10p ketaucho 20-11-2019 7 0   Download

While construction of the Aswan High Dam (AHD) has stopped concurrent flooding events, River Nile is still subject to low intensity flood waves resulting from controlled release of water from the dam reservoir. Analysis of flow released from New Naga-Hammadi Barrage, which is located at 3460 km downstream AHD indicated an increase in magnitude of flood released from the barrage in the past 10 years. A 2D numerical mobile bed model is utilized to investigate the possible morphological changes in the downstream of Naga-Hammadi Barrage from possible higher flood releases.

11p kethamoi1 17-11-2019 33 1   Download

In practice, the location of riverside water intakes is chosen based on land-property considerations rather than strict design criteria. For power plants intakes, abstraction efficiency is directly affected by the uniformity of flow distribution within the intake structure. The intake structure of South Helwan Power Plant (SHPP) is located downstream a Groin Like Formation (GLF) at the right bank of the Nile River, South Cairo, Egypt. This GLF disrupted the uniformity of flow approaching the intake.

9p trinhthamhodang1 14-11-2019 19 1   Download

A laboratory study is performed to evaluate the influence of elevated temperature on the strength and microstructural properties of high strength concretes (HSCs) containing ground pumice (GP), and blend of ground pumice and metakaolin (MK) mixture. Twelve different mixtures of HSCs containing GP and MK were produced, water-to-binder ratio was kept constant as 0.20. Hardened concrete specimens were exposed to 250 C, 500 C and 750 C elevated temperatures increased with a heating rate of 5 C/min.

14p christian2605 10-10-2019 26 0   Download

Reactive Powder Concrete (RPC) is a type of ultra-high strength concrete. Due to its dense microstructure, is vulnerable to explosive spalling at elevated temperatures. Remarkable application of RPC in special structures throughout the world has drawn the attention to understand the performance of RPC at elevated temperatures, which has not been investigated extensively yet. The main objective of this work was to evaluate the performance of RPC at elevated temperatures from 200 C to 800 C, by obtaining residual mechanical properties after exposure.

14p christian2605 10-10-2019 17 0   Download