scholarly journals Analisa Kinerja Aliran Fluida dalam Rangkaian Seri dan Paralel dengan Penambahan Tube Bundle pada Pompa Sentrifugal

2019 ◽  
Vol 3 (2) ◽  
pp. 71
Author(s):  
Muhammad Marzuky Saleh ◽  
Edi Widodo
Keyword(s):  
Flow Velocity ◽  
Tube Bundle ◽  
High Surface ◽  
Fluid Pressure ◽  
Discharge Flow ◽  
Flow Type ◽  
Pressure Discharge ◽  
Parallel Circuit ◽  
Parallel Tube ◽  
Pump House

Pump is a device used to move fluid from one place to another through the pipe media as a channel. The pump has 2 important components in its performance, namely: Impeller and pump house (casing). When the pump cannot meet the required capacity it can use series and parallel pump circuits to increase it. When moving the fluid to a high surface or high pressure it will have the specifications of the head and discharge. Fluid flow is a liquid that flows in a pipe. In flow there is fluid pressure and also flow type. There are 3 flow types, namely laminer, transition, turbulent. To reduce turbulence in the flow can be used Tube bundle which is a device consisting of several pipes that are tied together that are attached to a cross section in the pipe. This research was conducted in 4 testing stages, namely series circuit with additional tube bundle, series circuit without additional tube bundle, parallel circuit with additional tube bundle, parallel circuit without additional tube bundle. Each test takes fluid pressure, discharge, flow type. From the results of this study it was found that the parallel circuit pump with an additional tube bundle produces fluid pressure, discharge, flow velocity smaller than the series circuit, whereas when without additional the parallel tube pump bundle produces a fluid pressure, discharge, flow velocity greater than the circuit series, while for the flow type of this study is turbulent flow.

Effects of inclination and flow velocity on steam condensation consisting of air on tube bundle external surfaces

2021 ◽  
Vol 136 ◽  
pp. 103722
Author(s):  
Gonglin Li ◽  
Boyang Cao ◽  
Shuhang Zhou ◽  
Haozhi Bian ◽  
Ming Ding
Keyword(s):  
Flow Velocity ◽  
Tube Bundle ◽  
Steam Condensation

Cerebral blood flow velocity and cerebrospinal fluid pressure after single bolus of propofol

1989 ◽  
Vol 11 (3) ◽  
pp. 150-151 ◽  
Author(s):  
A. Parma ◽  
R. Massei ◽  
A. Pesenti ◽  
C. Ferrari da Passano ◽  
G. Gran ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebrospinal Fluid ◽  
Cerebral Blood Flow ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Cerebral Blood Flow Velocity ◽  
Fluid Pressure ◽  
Cerebrospinal Fluid Pressure ◽  
Single Bolus

Flow Induced Vibrations of Pressure Let-Down Station in QATARGAS

2006 ◽  
Author(s):  
Mohammed Y. Qaradawi ◽  
Abdulaziz R. Moshaweh
Keyword(s):  
Flow Velocity ◽  
Oil And Gas ◽  
Fluid Pressure ◽  
Gas Pipeline ◽  
Fluid Type ◽  
Flow Induced Vibration ◽  
Type Flow ◽  
Flow Induced Vibrations ◽  
Common Application ◽  
Safety And Stability

The use of the pipes to transfer oil and gases from production to export places is a common application in oil and gas industries. The safety and stability of the pipelines are crucial to prevent human and equipment losses. One of the criteria that jeopardize safety and stability of the pipelines is the vibration, and especially flow-induced vibration. Flow induced vibration in pipes is affected by many factors such as fluid type, flow velocity, fluid and pipes densities and fluid pressure. This study considers the analysis and modification of an upstream gas pipeline in QATARGAS Company. The study proposes some solutions to the problem of flow-induced vibration in pipes and the platform supporting them.

scholarly journals Failure Mechanism and Optimization of Throttle Valve Based on Computational Fluid Dynamics

2021 ◽  
Vol 39 (3) ◽  
pp. 906-912
Author(s):  
Ting Yang ◽  
Yi Hong ◽  
Aijun Wang ◽  
Xiaofeng Ran ◽  
Xiaojun Fan ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Field ◽  
Flow Velocity ◽  
Erosion Resistance ◽  
Fluid Pressure ◽  
Maximum Velocity ◽  
Field Analysis ◽  
Well Control ◽  
Throttle Valve

Throttle valve is an important device in well control manifold. During field use, the seat and plug of the valve often fail of erosion, posing a serious security risk to well control. Erosion resistance device is a tool to counter the problem. Using the three-dimensional (3D) flow field analysis software of computational fluid dynamics (CFD), this paper numerically simulates the flow field of erosion resistance device. The results show that, under the given boundary conditions, the mean velocity of the water flow does not change much as it passes through the inlet and outlet of erosion resistance device. The flow velocity changes very slightly, as the fluid pressure difference varies from 0.29MPa to 0.3MPa. The maximum flow velocity (16.36m/s) appears on the outlet wall of the device, beneath the alloy head. The alloy head, which is made of hard alloy material, is not greatly affected by the maximum velocity. Thus, the erosion resistance device will not be severely eroded. This means the erosion resistance device can work normally under actual conditions.

scholarly journals ANALISIS KOMPOSISI SERBUK GERGAJI TERHADAP KONDUKTIVITAS HIDROLIK PIPA MORTARI IRIGASI TETES BAWAH PERMUKAAN TANAH (Analysis of Sawdust Ratio on Hydraulic Conductivity in Subsurface Mortari Pipe of Drip Irrigation )

2018 ◽  
Vol 6 (1) ◽  
pp. 39-52
Author(s):  
Lalu Muhammad Ariandi ◽  
Guyup Mahardhian Dwi Putra ◽  
Sirajuddin Haji Abdullah
Keyword(s):  
Hydraulic Conductivity ◽  
Flow Velocity ◽  
Experimental Method ◽  
Coefficient Of Variation ◽  
Drip Irrigation ◽  
Water Discharge ◽  
Plant Type ◽  
Mixture Ratio ◽  
Discharge Flow ◽  
Coefficient Of Uniformity

Mortari emitter of sawdust (SG) can solve problem faced by farmers in dryland on irrigating their land. Aim of this research was to design an emitter by determining its mixture ratio and thickness. This research used experimental method by conducting experiment in laboratory. Observed parameters to determine water discharge were flow velocity, hydraulic conductivity value, coefficient of variation, and coefficient of uniformity. Ratio of cement, sand and sawdust to made sawdust (SG) mortari emitter were varied, i.e. P1 (1:2:2); P2 (2:1:3); P3 (2:4:4); P4 (2:2:2); and P5 (2:3:1). Result showed that the hydraulic conductivity could be classified as very low since K < 0.0036 cm/hour. The water discharge, flow velocity, and coefficient of uniformity were decreased in every reservoir elevation. Sawdust (SG) mortar emitter of P5 had the highest seeping ability and P3 had the lowest. The coefficient of uniformity (CU) value was 78,74%-80.64%. The use of Sawdust (SG) mortar emitter can be adjusted to the water discharge required by any plant type. The P3 emitter is suitable for plant which requires low water discharge and the P5 emitter is suitable for the high one. Keywords: water discharge, SG mortar emitter, hydraulic conductivity   ABSTRAK Emiter mortari serbuk gergaji (SG) dapat memecahkan masalah yang dihadapi para petani lahan kering dalam mengairi lahannya. Tujuan dilakukan penelitian ini adalah dapat merancang sebuah emiter dengan menentukan komposisi dan ketebalan emiter. Metode yang digunakan dalam penelitian ini adalah metode eksperimental dengan percobaan laboratorium. Parameter untuk menjawab tujuan penelitian adalah mencari nilai debit aliran yang dapat dihasilkan emiter mortari SG dengan menentukan kecepatan aliran, nilai konduktivitas hidrolik, koefisien variasi dan koefisien keseragaman. Emiter mortari SG dalam pengujian dilakukan dengan mencampurkan semen, pasir, dan serbuk gergaji masing-masing dengan 5 perbandingan, yaitu P1 (1:2:2); P2 (2:1:3); P3 (2:4:4); P4 (2:2:2); dan P5 (2:3:1). Nilai konduktivitas hidrolik didapatkan hasil pengkelasan dalam kategori sangat rendah karena memiliki nilai K<0,0036 cm/jam. Debit aliran, kecepatan aliran, dan koefisien keseragaman mengalami penurunan setiap ketinggian reservoir. Dimana emiter mortari SG dengan perlakuan P5 memiliki kemampuan merembeskan air dengan nilai tertinggi dan P3 pada emiter dengan kemampuan terendah. Nilai koefisien keseragaman pada emiter mortari SG terdapat keragaman dengan nilai CU sebesar 78,74%-80,64 %. Penggunaan emiter mortari SG dapat disesuaikan dengan jumlah kebutuhan debit air yang dibutuhkan oleh jenis tanaman. Emiter P3 baik digunakan pada tanaman dengan debit air rendah dan emiter P5 baik untuk tanaman dengan debit air tinggi. Kata kunci: debit aliran, emiter mortari SG, konduktivitas hidrolik

Different Type Tube Bundle Heat Transfer to Vertical Foam Flow

2007 ◽  
Author(s):  
Jonas Gylys ◽  
Stasys Sinkunas ◽  
Tadas Zdankus ◽  
Vidmantas Giedraitis
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Flow Velocity ◽  
Void Fraction ◽  
Tube Bundle ◽  
Auxiliary Equipment ◽  
Foam Flow ◽  
Flow Parameters ◽  
Tube Bundles ◽  
Foam Generator

Gas-liquid foam due to especially large inter-phase contact surface can be used as a coolant. An experimental investigation of the staggered and in-line tube bundles’ heat transfer to the vertically upward and downward laminar foam flow was performed. The experimental setup consisted of the foam generator, vertical experimental channel, tube bundles, measurement instrumentation and auxiliary equipment. It was determined dependency of heat transfer intensity on flow parameters: flow velocity, direction of flow, volumetric void fraction of foam and liquid drainage from foam. Apart of this, influence of tube position in the bundle to heat transfer was investigated. Foam flow structure, distribution of the foam’s local void fraction and flow velocity in cross-section of the channel were the main factors which influenced on heat transfer intensity of the different tubes. Experimental investigation showed that the heat transfer intensity of the frontal and further tubes of the bundles to vertical foam flow is different in comparison with one-phase fluid flow. The results of the experimental investigation are presented in this paper.

Experimental Identification of Fluid-Elastic Coupling Forces on a Square Tube Bundle Subjected to Single-Phase Cross-Flow

2016 ◽  
Author(s):  
Philippe Piteau ◽  
Xavier Delaune ◽  
Laurent Borsoi ◽  
Jose Antunes
Keyword(s):  
Flow Velocity ◽  
Single Phase ◽  
Tube Bundle ◽  
Cross Flow ◽  
Elastic Coupling ◽  
Coupling Coefficients ◽  
Flow Coupling ◽  
Modal Mass ◽  
Stiffness And Damping ◽  
Elastic Coefficients

The importance of fluid-elastic coupling forces in tube bundle vibrations is well documented and can hardly be over-emphasized, in view of their damaging potential. Even when adequate tube supports are provided to suppress fluid-elastic instabilities, the flow-coupling forces still affect the dynamical tube responses and remain a significant issue, in particular concerning the vibro-impact motions of tubes assembled using clearance supports. Therefore, the need remains for more advanced models of fluid-elastic coupling, as well as for experimental flow-coupling coefficients to feed and validate such models. In this work, we report an extensive series of experiments performed at CEA-Saclay leading to the identification of stiffness and damping fluid-elastic coefficients, for a 3×5 square tube bundle (D = 30 mm, P/D = 1.5) subjected to single-phase transverse flow. The bundle is rigid, except for the central tube which is mounted on a flexible suspension (two parallel steel blades) allowing for translation motions of the tube in the lift direction. The system is thus single-degree of freedom, allowing fluid-elastic instability to arise through a negative damping mechanism. The flow-coupling stiffness and damping coefficients, Kf(Vr) and Cf(Vr), are experimentally identified as functions of the reduced velocity Vr. Identification is achieved on the basis of changes in tube vibration frequency and reduced damping as a function of flow velocity, assuming a constant fluid added mass. In the present experiments, coefficient identification is performed well beyond the instability boundary, by using active control, thereafter allowing exploration of a significant range of flow velocity. The modal frequency and the modal mass of the system are respectively modified by changing the tube suspension stiffness, and/or by adding a mass to the system. We can thus assert how the fluid-elastic coefficients change, for this configuration, with these two system parameters, all other parameters being kept constant. The results obtained from the configurations tested suggest that formulations for coefficient reduction may be improved, in order to better collapse the identified data.

Statistical Mechanics Transport Model of Magnetic Drug Targeting in Permeable Microvessel

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
Xiaohui Lin ◽  
Chibin Zhang ◽  
Kai Li
Keyword(s):  
Blood Flow ◽  
Statistical Mechanics ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Interstitial Fluid ◽  
Transport Model ◽  
Coupling Effect ◽  
Drug Carrier ◽  
Fluid Pressure ◽  
Magnetic Drug Targeting

A transport model of magnetic drug carrier particles (MDCPs) in permeable microvessel based on statistical mechanics has been developed to investigate capture efficiency (CE) of MDCPs at the tumor position. Casson-Newton two-fluid model is used to describe the flow of blood in permeable microvessel and the Darcy model is used to characterize the permeable nature of the microvessel. Coupling effect between the interstitial fluid flow and blood flow is considered by using the Starling assumptions in the model. The Boltzmann equation is used to depict the transport of MDCPs in microvessel. The elastic collision effect between MDCPs and red blood cell is incorporated. The distribution of blood flow velocity, blood pressure, interstitial fluid pressure, and MDCPs has been obtained through the coupling solutions of the model. Based on these, the CE of the MDCPs is obtained. Present results show that the CE of the MDCPs will increase with the enhancement of the size of the MDCPs and the external magnetic field intensity. In addition, when the permeability of the inner wall is better and the inlet blood flow velocity is slow, the CE of the MDCPs will increase as well. Close agreements between the predictions and experimental results demonstrate the capability of the model in modeling transport of MDCPs in permeable microvessel.

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