Unsteady laminar flow in a circular tube :

Welch, James F.; Hurley, James A.; Glover, Michael P.; Nassimbene, Ryan; Yetzbacher, Marilyn R.

doi:10.6028/nist.ir.3963

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Eclipsing Cepheid Variables1

Beat Cepheids1

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1999

2024

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Cited by 2 publications

(2 citation statements)

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“…1. HV 5756 Our first reported discovery, HV 5756 (MACHO ID 78.6338.24) was reported in Welch et al (1996). A total of six primary minima have been observed at this writing (Dec 1998).…”

Section: Eclipsing Cepheid Variablesmentioning

confidence: 86%

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Cepheid Variables in the LMC and SMC

Welch

1999

Symp. - Int. Astron. Union

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“…1. HV 5756 Our first reported discovery, HV 5756 (MACHO ID 78.6338.24) was reported in Welch et al (1996). A total of six primary minima have been observed at this writing (Dec 1998).…”

Section: Eclipsing Cepheid Variablesmentioning

confidence: 86%

“…The second-overtone lightcurve derived from 1st/2nd-overtone beat Cepheid lightcurves is found to be very sinusoidal. Beaulieu et al (1997), Welch (1998), and Rorabeck (1997) have reported beat Cepheids in the SMC.…”

Section: Beat Cepheidsmentioning

confidence: 96%

Cepheid Variables in the LMC and SMC

Welch

1999

Symp. - Int. Astron. Union

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Modeling the Effect of Transient Viscous Forces on Sucker Rod Pump Performance and Run Lift

Aql,

Al-Safran

2024

Day 3 Wed, February 14, 2024

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The sucker rod pump is commonly used to lift heavy oil wells under thermal production to maximize the flow rate due to its high efficiency and reliability. However, rod fatigue and possible failure are commonly encountered when rod design does not incorporate the appropriate loads, especially in high-viscosity conditions. Although the existing commercial design tools solve the wave equation to predict rod string life, they do not incorporate the effect of liquid viscosity, resulting in prediction discrepancy and inappropriate rod design and pump operation. The aim of this study is to propose a theoretical model to investigate the effect of the transient frictional forces acting on sucker rod pump subsurface components, i.e. rod and pump. Furthermore, a sensitivity analysis case study is carried out to investigate the effect of various flow and design parameters on the rod top-of-section stresses, rod buckling tendency, and fatigue life. This work provides a comprehensive understanding of the underlying interaction between fluid flow behavior and rod dynamics.

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Unsteady laminar flow in a circular tube :

Abstract: Velocity Profile I, r r = P r = 0 z = 0 z = L NISTIR 3963

Cited by 2 publications

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Cepheid Variables in the LMC and SMC

Cepheid Variables in the LMC and SMC

Modeling the Effect of Transient Viscous Forces on Sucker Rod Pump Performance and Run Lift

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