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Characterization and Evaluation of Eco-Friendly Cutting Fluids
Published in Kishor Kumar Gajrani, Arbind Prasad, Ashwani Kumar, Advances in Sustainable Machining and Manufacturing Processes, 2022
Phaneendra Kiran Chaganti, Madan Mohan Reddy Nune
The purpose of the rheological test was to determine the fluid flow properties. The viscosity is the ratio of stress applied to the shear rate. The rheometer is the instrument used to determine the viscosity and viscoelasticity of a fluid. The working principle of a standard rheometer is shown in Figure 3.3. The rheometer works on either controlled strain rate or controlled stress. The strain rate is generally controlled with angular displacement of the motor, and the applied stress is determined based on the torque of the motor.
Characterization Techniques of Phase Change Materials: Methods and Equipment
Published in Amritanshu Shukla, Atul Sharma, Pascal Henry Biwolé, Latent Heat-Based Thermal Energy Storage Systems, 2020
Karunesh Kant, Amritanshu Shukla, Atul Sharma
The rheometer is a laboratory device that is used to measure the technique in which a liquid, suspension, or slurry flows in response to applied forces. It is used for those fluids that cannot be defined by a single value of viscosity and therefore require more parameters to be set and measured than is the case for a viscometer. Viscosity is a measure of the resistance of a fluid, which is being deformed by the shear stress. Stress is the measure of internal force applied to an object. Shear stress is the stress that is applied parallel to the face of an object or material. In every day terms, viscosity is “thickness or internal friction.” Viscometer is an instrument used to measure the viscosity of a fluid. It measures the rheology of the fluid. Rheology is the study of the flow of matter, primarily in liquid state. The term rheometer comes from the Greek word rheo, meaning flow, and rheometer is a device for “measuring flow.”
Rheology and Insulation Behaviour of Composites
Published in G. Mohamed Zakriya, G. Ramakrishnan, Natural Fibre Composites, 2020
G. Mohamed Zakriya, G. Ramakrishnan
Rheometers are utilized to measure the effect of fillers on polymer composites. Rheometers are classified into two categories: rotational and capillary types. They can be parallel-plate (rotational), torque rheometer capillary, torque rheometer extension type, and melt flow indexer capillary. Four types of rheological tests can be executed utilizing the parallel-plate or rotational rheometer: (i) steady shear sweep, (ii) frequency sweep, (iii) temperature sweep, and (iv) strain sweep. The independent variables are the natural fibre used, the melt flow index of the polymer or matrix, the frequency or shear rate, the melt temperature, the strain percentage, and the gap between the plates.
Characterization and experimental investigation of rheological behavior of oxide nanolubricants
Published in Particulate Science and Technology, 2021
Harsh Gupta, Santosh Kumar Rai, Piyush Kuchhal, Gagan Anand
Rheology is the study of flow and deformation of materials under applied forces using rheometer (Bhagat, More, and Khanna 2015). Rheological properties can be measured from bulk scale to nanoscale using rheometer. For bulk scale, rheological properties can be measured using mechanical rheometer, while for nanoscale, it can be measured using capillary viscometer. The viscosity for this experiment for five different samples were measured using ANTON PAAR Rheolab QC Rheometer along with the Rheolab software. Rheolab QC is a rotational rheometer with Peltier temperature device for varying temperature (0–180 °C). Corresponding shear stress, strain and dynamic viscosity were recorded using the ANTON PAAR rheometer’s software. Moreover, the temperature was controlled by connection of Peltier temperature device (C-PTD 180/AIR/QC) or liquid temperature device (C-LTD 80/QC) with a water bath thermostat for exact temperature control of the measuring cup and the sample. [Anton PAAR official website]. Multiple tests were conducted at different temperature i.e., room temp, 30, 40, 50, 60, 70, and 80 °C. The shear rate was varied from 1 to 1000 (1/s) for each test.
Rheometry based on free surface velocity
Published in Inverse Problems in Science and Engineering, 2019
A. J. M. AL-Behadili, M. Sellier, R. Nokes, M. Moyers-Gonzalez, P. H. Geoghegan
In a flow bounded by a free surface, perturbations induced by boundary or initial conditions are transferred to the fluid free surface and induce free surface velocity variations. This transfer is dependent on the rheology of the fluid. This study explores the hypothesis that the free surface velocity field is a signature of the fluid rheology and therefore that the fluid rheology can be inferred indirectly by measuring the free surface velocity field. Typically, a rheometer is used to measure the rheology of fluids. However, standard rheometers produce low quality results or do not work at all when the fluid sample is extremely hot (lava), dangerous (nuclear wastes), in too small a quantity (aerosol particles), or inaccessible (remotely observed flows on other planets) [1]. Furthermore, the behaviour of some fluids change when handled, for example snow in an avalanche. It is therefore important to find alternative ways to measure the rheology of fluids in such cases. In this paper, the dam-break problem is considered, which results from the release of a gate initially separating two fluid pools of different depth and the rheological parameters are identified by minimizing the difference between measured and simulated data.
Rheological wall slip velocity prediction model based on artificial neural network
Published in Journal of Experimental & Theoretical Artificial Intelligence, 2019
Ren Jie Chin, Sai Hin Lai, Shaliza Ibrahim, Wan Zurina Wan Jaafar, Ahmed Elshafie
The appearance of wall slip can affect rheological measurements, producing an apparent (measured) viscosity that is lower than the actual (true) viscosity. Rheological measurements such as shear rate, shear stress and viscosity are usually performed with a viscometer or various types of rheometer. The most commonly used rheometers are parallel plate, concentric cylinder and capillary tubes (Cohen & Metzner, 1982, 1986; Jana, Kapoor, & Acrivos, 1995; Pérez-González, López-Durán, Marín-Santibáñez, & Rodríguez-González, 2012; Yaras, Kalyon, & Yilmazer, 1994; Yilmazer & Kalyon, 1989).