Unconfined laminar nanofluid flow and heat transfer around a rotating circular cylinder in the steady regime

The primary objective of this study was to assess the operational efficiency of an oscillating heat pipe featuring an inner diameter of 1.7 mm and an outer diameter of 3 mm. This OHP was filled with an acetone-based fluid infused with graphene nanoparticles. The research aimed to analyze the effects of altering filler ratio and heat inputs on temperature difference, heat transfer coefficient, and thermal resistance in an oscillating heat pipe, with a specific focus on filler ratios ranging from 50% to 80% and heat inputs between 20W and 40W. The results reveal that there is a maximum in heat transfer coefficient of 220.48W/m 2 ºC and 224.1 W/m 2 ºC for acetone and graphene respectively. There is a decrease in thermal resistance 0f 1.441ºC/W and 1.421ºC/W for acetone and graphene for optimal combinations (40W with 80% filler ratio). Finally, the experimental data of 1800 data sets were used to develop the Artificial Neural network model using Radial basis function by considering three input parameters viz, fill ratio (50% to 80%), heat load (25W to 40W) and time with an output of temperature difference, heat transfer coefficient and thermal resistance. The developed ANN using the radial basis function (RBF) was able to predict the experimental parameters of temperature difference, heat transfer coefficient and thermal resistance with 97.70% and 97.12% accuracy for graphene and acetone respectively. Based on the obtained results MSE values for graphene and acetone are 1.015 and 1.064 respectively.

Section: Introductionmentioning

confidence: 99%

Radial basis Neural Network Model to Prediction of Thermal Resistance and Heat Transfer Coefficient of Oscillating Heat Pipe Using Graphene and Acetone-Based Nanofluids

2024

“…Other studies focused on the hydrodynamics and heat transfer such as [35][36][37][38][39]. The use of nanofluids with pulsed flow was studied by [40][41][42][43][44][45][46][47][48] where wave and corrugated channel were used during these studies. A number of numerical and experimental studies investigated non-Newtonian fluid's heat transfer inside the wave channel and under the pulsate flow [49][50][51].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fuel Pulsatile Flow Through Wavy Channel

2024

In this numerical study, the heat transfers of two types of fuels, namely kerosene and gasoline, were studied within a wavy channel with pulsed flow. The CFD module at COMSOL Multiphysics was used in this study. Several variables were used and applied to both types of fuel and compared between them. These variables included the values of Reynolds numbers between 200 to 800, as well as several values of Strouhal Numbers between 0 to 0.25. Different variable values were also used for the wavy channel, including the wave numbers (0, 2, 4, 6, 8, 10) as well as variable values of the wave amplitude (0, 0.1, 0.2, 0.3). Through this study, it was observed that as Strouhal Numbers increase, there is an increase in the Nusselt Number value. It was also observed that as the number of waves increases, there is an improvement in the heat transfer values. The numerical results showed that the values of heat transfer improved with an increase in the amplitude of the wave..

“…References [30][31][32][33] explore the topic of chemically reactive nanofluids flowing across a horizontal cylinder, with a focus on the effects of chemical reactions on convective heat transfer and fluid flow. The studies use experimental and modeling approaches to investigate the influence of various nanofluid properties on heat transfer and flow behavior.…”

Section: Introductionmentioning

confidence: 99%

Chemically Reactive Nanofluid Flowing across Horizontal Cylinder

2023

The objectives of this work are to build a mathematical model for the nanofluid flow problem in the presence first order chemical reaction. The flow over an isothermal horizontal circular cylinder is selected due to many engineering applications for this geometry. A set of nonlinear partial differential equation, coupled, that describes the physical behavior of the problem under study was derived. Numerical ways, finite element techniques, were used to treat the mathematical model. The most important quantities that have a good effect on the physical matter that appeared in the mathematical definition are the dimensionless chemical reaction parameter, the Brownian motion parameter and the thermophoresis parameter.The influence of these dimensionless quantities on the velocity, temperature and concentration profiles is drawn graphically. Moreover, the influence on the engineering measures that have physical implementation, such as the local skinfriction coefficient, Nusselt Number, and Sherwood number are also discussed. It is observed that increasing chemical reaction parameter Λ tends to decrease velocity and concentration values but slightly enhances temperatures in the flow field; a rise in Λ also enhances values of the local Sherwood number but strongly reduces the local Nusselt number at the cylinder surface as so as the local surface shear stress function.