Natural convection of Carreau–Yasuda non-Newtonian fluids in a vertical cavity heated from the sides

Alloui, Z.; Vasseur, P.

doi:10.1016/j.ijheatmasstransfer.2015.01.092

Cited by 64 publications

(29 citation statements)

References 33 publications

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“…Alloui [20] studied natural convection in a non-Newtonian fluid in a vertical cavity using the Carreau-Yasuda model and showed that compared to Newtonian fluids, the rate of heat transfer and convection strength increased when n < 1 and decreased when n > 1. The changes in the n value did not greatly affect the rate of heat transfer when the Rayleigh number was small.…”

Section: Natural Convection Of Non-newtonian Fluids In a Square Cavitmentioning

confidence: 99%

Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source

Raisi¹

2016

SV-JME

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This study investigates the natural convection cooling of a heat source placed on the bottom of a cavity filled with non-Newtonian power-law fluids. The heat source produces a uniform heat flux. The remaining parts of the bottom wall of the cavity are insulated, and the vertical, and top walls are kept at a low temperature. The governing equations for the power-law fluid flow are solved with the numerical finite difference method based on the control volume formulation and SIMPLE algorithm. The study investigates the effects of relevant parameters such as the Rayleigh number, the power-law index and the heat source length and heat source location on the thermal performance of the cavity. The results show that as the Rayleigh number increases, particularly when n<1, the thermal performance of the cavity is improved. Furthermore, using non-Newtonian shear thinning fluids, especially at higher Rayleigh numbers, improves the cooling performance of the heat source. The results also show that, depending on the Rayleigh number and the power-law index, the length and position of the heat source have significant effects on the thermal performance of the cavity.

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Section: Natural Convection Of Non-newtonian Fluids In a Square Cavitmentioning

confidence: 99%

Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source

Raisi¹

2016

SV-JME

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“…21 was used as a starting point. The infinite shear rate viscosity is set to 0 . Since bulk modulus curves often exhibit an initial slope and slightly irregular slopes close to the dynamic solubility limit small adaptions were necessary in order to improve its fitting capacity.…”

Section: Methodsmentioning

confidence: 99%

Theoretical Background and Automation Approach for a Novel Measurement Method for Determining Dynamic Solubility Limits of Supercritical Fluids in Injection Foam Molding

Kastner

Steinbichler

2019

Polymer Engineering & Sci

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In terms of sustainability, injection foam molding gains in importance. Yet still many questions throughout the whole process remain unanswered. Especially, the conditions inside the cylinder during gas injection are fraught with uncertainty. Our development of a new methodology for the determination of dynamic solubility in injection foam molding helps to answer the most basic question regarding gas loading: Using the bulk modulus of the polymer-gas mixture, the dynamic solubility limit can be detected. In a first series of tests, the methodology was verified with simultaneous ultrasonic measurements-an excellent agreement was observed. In this work, a second, more thorough test series is presented. Using the bulk modulus methodology on different polypropylene grades, dynamic solubility limits between 0.62 and 2.56 wt% nitrogen at pressures between 80 and 200 bar and a temperature of 230 C were determined directly on an injection molding machine. The detailed theoretical background for this technique, as well as a mathematical automation approach, is provided. This innovative yet simple method yields novel insights on process limits and provides the possibility of an a priori machine setup or a fully automatic self-adjustment of the machine. POLYM. ENG. SCI., 60:330-340, 2020.

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“…In their study, they implemented thermophoresis and Brownian diffusion and explored the heat transfer rate (HTR) effectively due to such flow pattern. Further, natural convection flow in a vertical channel, 2 two‐dimensional (2D) boundary layer flow in a heated vertical cavity, 3 convectively heated stretched flow, 4 impact of CCHF model associated with variable thermal conductivity flow, 5 and impact of normal surface condition on MHD flow 6 of Carreau or Carreau‐Yasuda fluids were analyzed. The above studies reveal that the impacts of variable chemical reaction and nonlinear transfer rate (NLTR) on the MHD flow of CNF exponentially extended surface have not been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

MHD nonlinear radiative flow of Carreau nanofluid with variable chemical reaction: An approach to control global warming

et al. 2020

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Solar energy is a significant source of clean and renewable energy, which can be harnessed to control global warming/pollution levels. Carreau nanofluid models have been used in the cooling of solar devices so as to upgrade the efficiency of solar energy systems. The energy equation is modeled by adopting nonlinear thermal radiation because it has a major role on the solar energy absorption capacity of nanofluid. Diffusion of species involving chemical reactions in boundary layer flow finds overwhelming applications in pollution studies, polymer production, in the design of chemical processing equipments, and so forth. In view of this, the present article is developed to evaluate the impact of nonlinear thermal radiation, chemical reaction, and applied magnetic field to the flow of Carreau nanoliquid induced by exponentially extendable surface. The outcomes of the preset study include that more magnetized the conducting fluid contributes more controlled motion of both shear thinning and shear thickening fluids. Axial and transverse surface viscous drag forces, rate of heat, and mass transportation augment with raising Weissenberg parameter while temperature and concentration fields attain a descending trend due to it. In addition, augmented temperature ratio parameter upgraded the thermal field.

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Natural convection of Carreau–Yasuda non-Newtonian fluids in a vertical cavity heated from the sides

Cited by 64 publications

References 33 publications

Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source

Natural Convection of Non-Newtonian Fluids in a Square Cavity with a Localized Heat Source

Theoretical Background and Automation Approach for a Novel Measurement Method for Determining Dynamic Solubility Limits of Supercritical Fluids in Injection Foam Molding

MHD nonlinear radiative flow of Carreau nanofluid with variable chemical reaction: An approach to control global warming

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