The frequency response of rotameters

Harrison, G. S.; Armstrong, W. D.

doi:10.1016/0009-2509(60)80003-6

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…Up till now research on dynamics of variable area flowmeters has concerned their behavior in presence of pulsations [14,15,16]. This aspect is important in case of such pulsation sources as reciprocating pumps or other sources classified in Ref.…”

Section: Introductionmentioning

confidence: 99%

Minimization of the Settling Time of Variable Area Flowmeters

Turkowski

Szczecki

Szudarek

2019

Sensors

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In the article a differential equation describing transient behavior of variable area (VA) meters has been developed and validated experimentally for air as a measured fluid and for two float shapes—plumb bob and sphere. A modified version of simplex algorithm adapted for nonlinear constraint optimization problems was applied to minimize the settling time of VA meters in two cases. In the first case both the float and tube geometry were altered. In the second case only the float geometry was modified. The second case has been validated experimentally. The theory and experiment is in reasonable agreement (under 5% of full scale), which is satisfactory for the purposes of optimization of VA flowmeters dynamic performance. Analytical model of VA flowmeter has been proven to be a proper tool for optimization. Settling times obtained during the optimization process were several times shorter than these of commercially manufactured instruments. Overshoot has not exceeded the assumed value of 3%.

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Section: Introductionmentioning

confidence: 99%

Minimization of the Settling Time of Variable Area Flowmeters

Turkowski

Szczecki

Szudarek

2019

Sensors

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“…Harrison and Armstrong investigated the dynamic behavior of a rotameter float and proposed a simplified differential equation in order to calculate the response of the float [16]. As the angular velocity increases, float specific gravity decreases and viscosity increases, there is significant difference between the calculated and measured values.…”

Section: Introductionmentioning

confidence: 99%

Steady and transient flow structure in a rotameter with a ball float

Canlı

Ateş

2019

EPJ Web Conf.

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Dimensions and material specifications of a commercial rotameter were used for investigating steady and transient flow structure in a rotameter with a ball float. Since drag coefficient of sphere versus Reynolds number is well known and the range of the commercial rotameter is given, the investigation relies on strong validation data. An axially symmetric geometric model is used for steady analysis of the system as the initial step of the investigation. Assessing the proper mesh structure and turbulence model is aimed for this step. Then full three dimensional solid model is put into transient analysis with RANS and LES models. Vortex shedding frequency, Strouhal number and drag coefficient values are evaluated. Vortex induced vibrations are assessed according to transient results. The work is a preliminary study for future investigation on rotameter floats. The framework of future studies is also presented.

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Pulsation error in a rotameter

Baird

Cheema

1969

Can J Chem Eng

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The effect of square‐wave pulsations in gas flow on the performance of a rotameter has been studied. The experimental variables were pulsation frequency (1–24 Hz), gas flow rate, gas density, float mass, and the gas volume between the pulse generator and the flowmeter. The fluctuation in float position was found to decrease with increasing frequency and this was in agreement with a simplified theoretical model. Pulsation caused the rotameter to over‐read by as much as 100% and in some cases the error was appreciable even when the float was almost stationary. The error decreased as the damping volume was increased. The factor of error was correlated empirically with the above variables. The results were also compared with other published data and theory, and with a numerical solution of the equations of motion of the float. The numerical solution was found to predict the error satisfactorily in cases where a damping chamber was used and where float bouncing did not occur.

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The frequency response of rotameters

Cited by 5 publications

References 1 publication

Minimization of the Settling Time of Variable Area Flowmeters

Minimization of the Settling Time of Variable Area Flowmeters

Steady and transient flow structure in a rotameter with a ball float

Pulsation error in a rotameter

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