Effect of Thermal Convection on Viscosity Measurement in Vibrational Viscometer

Akpek, Ali; Youn, Chongho; Maeda, Atsushi; Fujisawa, Nobuyuki; Kagawa, Toshiharu

doi:10.4236/jfcmv.2014.21003

Cited by 11 publications

(6 citation statements)

References 14 publications

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“…As explained in detail in earlier research of this study in order to comprehend the flow movements in the experimental cup, the velocity fields were measured by particle image velocimetry (PIV) [29][30][31][32]. This confirmed to us that severe viscosity variations may occur even in very small volumes as the temperature of the fluid rises swiftly.…”

Section: Flow Visualizationsupporting

confidence: 72%

A novel design of an electromagnetically levitated vibrational viscometer for biomedical and clinical applications

Akpek¹

2019

Turk J Elec Eng & Comp Sci

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Accurate determination of the viscosity behavior of fluids is extremely important, especially for biomedical and clinical applications. For example, blood viscosity is used to detect cardiovascular diseases in patients. Like blood, all body fluids and biochemical solvents used in biomedical studies are very limited resources. Therefore, a viscometer that is especially focused for biomedical and clinical applications should have the ability to obtain viscosity results from a reservoir as small as possible, in a range as wide as possible and in a period of time as short as possible. The measurements must be accurate even when the fluid temperatures shift swiftly and the test fluids pass throughout the viscometer continuously. Thus, it would be a huge advantage if a viscometer had the capability to measure simultaneously dynamic viscosity, kinematic viscosity, static viscosity, and density. However, there is no viscometer in the world that can achieve these goals. In this study, a novel electromagnetically levitated vibrational viscometer is designed to solve this problem.

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Section: Flow Visualizationsupporting

confidence: 72%

A novel design of an electromagnetically levitated vibrational viscometer for biomedical and clinical applications

Akpek¹

2019

Turk J Elec Eng & Comp Sci

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“…Vibration methods are performed by immersing a shaking resonator in a sample to measure amplitude attenuation. Nevertheless, this method is sensitive to thermal mixing (Akpek et al., 2014) and is only valid for very dilute suspensions, for example, less than 100 cp (Kandil, 2005).…”

Section: Discussionmentioning

confidence: 99%

Viscosity of Cohesive Sediment‐Laden Flows: Experimental and Empirical Methods

Shen,

Lin,

Pan

et al. 2024

JGR Oceans

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The rheological behaviors of suspended sediments are crucial for investigating near‐bed particle dynamics; for these investigations, the viscosity of a highly concentrated suspension is primarily focused on quantifying its resistance to deformation. By using a rotational viscometer, the relationships between relative viscosities (ηr) for different sediment types and their volumetric concentrations (ϕ) are studied for low‐to high‐concentration slurries. The results show that the conventional Einstein formula for diluted sand severely underestimates ηr. In the case of pure silts and non‐cohesive quartz, ηr demonstrates a gradual linear increase, reaching values around order of 101 as ϕ increases within the range of 0.2–0.4. Meanwhile, the ηr values of clays exhibit an exponential rise before leveling off at a plateau. Specifically, the ηr values of kaolinite, montmorillonite, and bentonite rise with ϕ lower than 0.3 and reach to plateau of values of thousands, which rise more rapidly than chlorite and illite. The modified viscosity model based on Costa (2005, https://doi.org/10.1029/2005GL024303) agrees reasonably well with observations and produces similar ηr ∼ ϕ relationships. In addition, the model is coupled with a hydrodynamic model to simulate the deposition of a thickened tailings slurry and a one‐dimensional dam break. The proposed model performs well in predicting the quasi‐equilibrium profiles of the non‐Newtonian fluid, which are validated by available analytical solutions. The results suggest that future models should be focused on the effects of flow properties, especially for non‐Newtonian fluids, and on large‐scale modeling applications, which can increase the accuracy of predictions of the transport characteristics of sediments and pollutants in rivers, lakes, and coastal areas.

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“…Capillary viscometers work by measuring the fluid flowrate or the time it takes for a known volume of fluid to flow through a capillary with a fixed length and diameter, or by comparing the measured pressures required to keep a fluid moving with a constant flow rate through capillaries with same diameter and varied lengths [ 140 , 141 , 142 ]. Some examples of mechanical viscometer techniques are rotational movements [ 143 , 144 ], falling objects viscometer [ 145 , 146 , 147 ], and vibrational sensors [ 148 , 149 , 150 ]. Another laboratory setup is the rotational based viscometer that determines the viscosity from the measured torque change of a body with known mass and dimensions rotating at a constant speed in the test fluid [ 151 , 152 ].…”

Section: Viscosity Sensorsmentioning

confidence: 99%

A Review of the Real-Time Monitoring of Fluid-Properties in Tubular Architectures for Industrial Applications

Nour

Hussain

2020

Sensors

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The real-time monitoring of fluid properties in tubular systems, such as viscosity and flow rate, is essential for industries utilizing liquid mediums. Nowadays, most studies of the fluid characteristics are performed off-line using laboratory facilities that can provide accurate results, yet they do not match the demanded industrial pace. Off-line measurements are ineffective and time-consuming. The available real-time monitoring sensors for fluid properties are generally destructive methods that produce significant and persistent damage to the tubular systems during the installation process. Others use huge and bulky invasive instrument methods that generate considerable pressure reduction and energy loss in tubular systems. For these drawbacks, industries centered their attention on non-invasive and non-destructive testing (NDT) methodologies, which are installed on the outer tubular surface to avoid flow disturbance and desist shutting down systems for installations. Although these sensors showed excellent achievement for monitoring and inspecting pipe health conditions, the performance was not convincing for monitoring the properties of fluids. This review paper presents an overview of the real-time monitoring of fluid properties in tubular systems for industrial applications, particularly for pipe monitoring sensors, viscosity, and flow measurements. Additionally, the different available sensing mechanisms and their advantages, drawbacks, and potentials are discussed.

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Effect of Thermal Convection on Viscosity Measurement in Vibrational Viscometer

Cited by 11 publications

References 14 publications

A novel design of an electromagnetically levitated vibrational viscometer for biomedical and clinical applications

A novel design of an electromagnetically levitated vibrational viscometer for biomedical and clinical applications

Viscosity of Cohesive Sediment‐Laden Flows: Experimental and Empirical Methods

A Review of the Real-Time Monitoring of Fluid-Properties in Tubular Architectures for Industrial Applications

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