The Effects of Screw Geometry on the Pumping Efficiency of Micro‐Screw Pump

El-Sadi, Haifa; Esmail, Nabil

doi:10.1002/cjce.5450830603

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Viscosity is one factor considered when selecting the best pump for different liquids. Optimum screw pitch depends on viscosity, screw depth, and other geometry factors of pump (El‐Sadi and Esmail 2005). The Herschel‐Bulkley model was used to evaluate the viscosity of each sample (Singh 2023).…”

Section: Resultsmentioning

confidence: 99%

“…This is attributed to the relatively greater number of product flights across the threads in a lower pitch screw when compared to a higher pitched one. On the other hand, a higher screw pitch can displace larger volumes of liquid due to the lower number of product flights (El‐Sadi and Esmail 2005). We theorise that pumping of high‐fat cream requires lower shear stress across the screw to prevent the disruption of emulsion.…”

Section: Resultsmentioning

confidence: 99%

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Qualitative evaluation of factors affecting the undesirable fat emulsion disruption during the processing of high‐fat cream

Singh,

Vashisht,

Ewonus

et al. 2024

Int J of Dairy Tech

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Handling and transportation of high‐fat cream needs to be done gently; otherwise, undesirable destabilisation of the fat emulsion is likely to occur. This study delves into the processing factors that cause the disruption of fat emulsion in high‐fat cream. The cream viscosity was 48.6 mPa.s at 7.2°C. Results revealed that pump screw pitches of 32 and 43 mm and rotational speeds of 264 and 464 LPM were the significant factors that caused the butter formation in the cream. There was significant emulsion breakdown, regardless of the degree of fat crystallisation at 6.5 ± 0.5°C for a minimum of 12 h.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Qualitative evaluation of factors affecting the undesirable fat emulsion disruption during the processing of high‐fat cream

Singh,

Vashisht,

Ewonus

et al. 2024

Int J of Dairy Tech

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“…The pressure head obtained with geometric model 1 (three blades and pitch length of 30 mm) was found to be higher than the geometric model 3 (three blades and pitch length of 45 mm). Similarly, the head obtained for geometric model 2 (four blades and pitch length of 30 mm) was higher than the geometric model 4 (four blades and pitch length of 45 mm), so as the pitch length of the flights decreases the pressure head increases [20]. A pitch length of 30 mm is proven to be beneficial and helps in more guided inner flow within the Liquivac pump.…”

Section: Variation Of Pressure Head and Efficiencymentioning

confidence: 86%

Effect of Geometric Configuration of the Impeller on the Performance of Liquivac Pump: Single Phase Flow (Water)

Meerakaviyad

Keville

Prakash

et al. 2022

Fluids

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Liquivac pumps, with their unique shaped twin start helical rotor, have found utility in various sectors but the major drawback limiting in their global exploitation is their low performance. This paper investigates the study of performance of the Liquivac pump produced by Tomlinson Hall Ltd. Experimental data was used to validate a numerical model developed in Ansys Fluent 20.2 for the Liquivac pump. Four different geometric models of the rotor were tested numerically to find the optimum design using blade number and pitch length as the criteria to achieve improved efficiency. The choice of turbulence model is an important factor in the most accurate prediction with computational fluid dynamics (CFD) simulation. Four different turbulence models were validated with experimental measurements. The realizable K-ε model gave the most accurate performance predictions with a relative deviation of 3.8%. So, the realizable K-ε model was employed for further parametric optimization of the rotor. The results indicate a reasonable improvement in the head and efficiency of the Liquivac pump with a new rotor geometry of four equidistant blades in the front, back and four flights with 30 mm pitch. This is attributed to the most favourable balance between the different losses and most guided and uniform flow inside the rotor channels.

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“…Depending on the value of the backpressure and cylinder eccentricity, the pump start up in some cases was characterized by a backflow followed by a positive flow, or vice versa. El-Sadi, H. and Esmail, N. [9] investigated the effect of using various screw geometries on the pump performance. Theoretical analysis by finite volume simulations is carried out to study the influence of the screw pitch and the thread (flight depth) to evaluate the optimal dimensions for the pump and to obtain the maximum flow rate.…”

Section: Literature Reviewmentioning

confidence: 99%

Simulation Study of Screw Micro Pumps Design and Performance

Ezat

El-Sawaf

Mohamed

et al. 2015

International Conference on Aerospace Sciences and Aviation Tec

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Increasing efforts are being directed towards applying the technologies of micro-fluidic, to the development of micro-devices for a wide range of applications such as medical, biological, engineering and related technologies. The present studies are interested with the design of micro-screw pump for viscous fluid and its operating behaviour, the steady performance of the micro-pump will be investigated numerically. The present numerical investigation is a comparative study of a steady flow behavior in a micro-channel with rotating screw with different operation and design parameters. The numerical investigation is performed using computational fluid dynamic techniques. The FLUENT program as CFD simulation program in the ANSYS 14.0 package used to simulate the pump model. The results of the simulation problem give an agreement with literature experimental results which validate the simulation model that encourage future simulation of the studied system. Theoretical analysis is carried out to study the influence of the helix angle, diameter of the screw, screw length and the thread height (flight depth) to evaluate the optimal dimensions for the pump to obtain the maximum flow rate and pump performance. the effect of screw angular velocity and pump load were studied.

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The Effects of Screw Geometry on the Pumping Efficiency of Micro‐Screw Pump

Cited by 5 publications

References 12 publications

Qualitative evaluation of factors affecting the undesirable fat emulsion disruption during the processing of high‐fat cream

Qualitative evaluation of factors affecting the undesirable fat emulsion disruption during the processing of high‐fat cream

Effect of Geometric Configuration of the Impeller on the Performance of Liquivac Pump: Single Phase Flow (Water)

Simulation Study of Screw Micro Pumps Design and Performance

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