Momentum Transfer in Curved Pipes. 1. Newtonian Fluids

Мишра, П. К.; Gupta, S. N.

doi:10.1021/i260069a017

Cited by 286 publications

(86 citation statements)

References 3 publications

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“…The Fanning friction factor 27,28 contributes to pressure drop (Dp) served as the variable compared with numerical simulation for empirical calculations, which is defined by equation ( …”

Section: Validation Of Numerical Codesmentioning

confidence: 99%

A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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Flow characteristics and loss mechanism inside the helical pipe with large-caliber and large-scale Dean number were analyzed in this study. Numerical simulation was carried out for exploring velocity distribution, pressure field, and secondary flow by varying coil parameters such as Dean number, curvature radius, and coil pitch. The velocity gradient in the cross-section increases along the pipe and causes unsteady flow in the pipe. Large pressure differences in the 180°and 315°cross-section generate centrifugal forces on the pipe. The secondary flow is the major factor resulting in flow loss, presented obviously by the streamlines to analyze the effects of pipe parameters on the vortices. The vortex center shifts toward the upper wall with the increase in Dean number and takes a slight deflection with the increase in coil pitch. Meanwhile, a correlation of the flow loss extent inside the pipe as a function of friction factor was presented. The increases in curvature radius and coil pitch can diminish the friction factor to reduce flow losses. The accuracy of the numerical methodology was also validated by conducting corresponding experiments and empirical mathematical analysis. The maximum deviation between the experimental values and the simulated results of the pressure drop is just 2.9%.

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“…The Fanning friction factor 27,28 contributes to pressure drop (Dp) served as the variable compared with numerical simulation for empirical calculations, which is defined by equation ( …”

Section: Validation Of Numerical Codesmentioning

confidence: 99%

A numerical study of flow characteristics in a helical pipe

Tang

Parameswaran

2016

Advances in Mechanical Engineering

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“…Correlations from Mishra and Gupta [48], Ito [49], and White [50], as shown in Table 2, were used here to determine the friction factor in the outer helical tube for solar salt and the given geometry. Results were obtained using Re* for annular ducts as defined by Gnielinski [51][52][53]:…”

Section: Outer Tube Friction Factorsmentioning

confidence: 99%

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

2017

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Mineral calcination worldwide accounts for some 5-10% of all anthropogenic carbon dioxide (CO 2 ) emissions per year. Roughly half of the CO 2 released results from burning fossil fuels for heat generation, while the other half is a product of the calcination reaction itself. Traditionally, the fuel combustion process and the calcination reaction take place together to enhance heat transfer. Systems have been proposed that separate fuel combustion and calcination to allow for the sequestration of pure CO 2 from the calcination reaction for later storage/use and capture of the combustion gases. This work presents a new tube-in-tube helical system for the calcination of minerals that can use different heat transfer fluids (HTFs), employed or foreseen in concentrated solar power (CSP) plants. The system is labeled 'flameless' since the HTF can be heated by other means than burning fossil fuels. If CSP or high-temperature nuclear reactors are used, direct CO 2 emissions can be divided in half. The technical feasibility of the system has been accessed with a brief parametric study here. The results suggest that the introduced system is technically feasible given the parameters (total heat transfer coefficients, mass-and volume flows, outer tube friction factors, and -Nusselt numbers) that are examined. Further experimental work will be required to better understand the performance of the tube-in-tube helical system for the flameless calcination of minerals.

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“…Ito [4] f Kubair and Varrier [5] f c ¼ 0:003538 N Re 0:09 expð1:887d=DÞ 9000 < N Re < 25 000 10 < D/d < 27 Empirical Mishra and Gupta [8] f …”

Section: Number Of Turnsmentioning

confidence: 99%

“…During the pumping experiment, water was collected into a measuring cylinder from the pump discharge line (Make: Borosil, (i) capacity 100 cm 3 (8). The average value of ten readings was taken as a volumetric throughput for a given experiment condition and results were found to be within 2.5 % of the relative standard deviation.…”

Section: Equipment Design Parametersmentioning

confidence: 99%

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Development of helical coil based fluidic diode pump for liquid pumping

et al. 2017

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The main selection criterion for pumps in reprocessing applications is the absence of any moving parts or the moving parts not having any direct contact with the process fluid. There are different types of fluidic pumps such as vortex diode, reverse flow diode, etc. In this work, a new design of helical coil fluidic pump has been developed and demonstrated. Helical coils are widely used in process industries as heat exchangers, reactors, motionless mixers, etc. It is for the first time that the authors are proposing the use of helical coil as a fluidic pump based on its inherent property of high pressure drop as compared to a straight tube.The main objective of this work is to develop an alternate pumping system for reprocessing applications to replace the conventional air lift pump. The helical coil based fluidic diode pump was made up of SS 304 seamless pipe (pipe inner diameter is 9.5 mm) with a 36 mm diameter of helical coil and pitch of 14 mm. In this work, friction factor for the given helical coil was measured from pressure drop experiments. This information was also useful for understanding the transition of the laminar to turbulent region. In order to propose the operating region, the pumping capacity was measured for the helical coil based fluidic pump at different operating conditions. Experimental results show that the proposed hardware is able to pump up to 54 dm 3 /h. Recommendations have been made for proposing an optimum design.

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Momentum Transfer in Curved Pipes. 1. Newtonian Fluids

Cited by 286 publications

References 3 publications

A numerical study of flow characteristics in a helical pipe

A numerical study of flow characteristics in a helical pipe

Stop Smoking—Tube-In-Tube Helical System for Flameless Calcination of Minerals

Development of helical coil based fluidic diode pump for liquid pumping

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