heat transfer

Haar wavelet collocation method for solving boundary layer flow and heat transfer over a moving plate in a carbon nanotubes with MHD effect

This study aims to explore the consideration of boundary layer flow and heat transfer over a moving plate with the presence of the magneto-hydrodynamics at the surface in carbon nanotubes.  The mathematical model for the boundary layer flow problem is obtained and solved using numerical techniques based on Haar wavelet collocation.  The types of nanoparticles used in this research were single-walled carbon nanotubes and multi-walled carbon nanotubes with water and kerosene that were used as base fluid.  The partial differential equations are transformed into nonlinearly

Effects of suction on steady boundary layer stagnation-point flow and heat transfer in porous medium towards a stretching/shrinking sheet with thermal radiation

In this study, the effects of suction and thermal radiation on steady boundary layer stagnation point flow and heat transfer in porous medium towards a stretching and shrinking sheet is investigated.  The governing partial differential equations (PDEs) are transformed into Nonlinear Ordinary Differential Equations (ODEs) utilizing similarity transformation.  These equations are then solved numerically using the function BVP4C in MATLAB, with the numerical results presented through graphical illustrations.  The investigation uncovers the existence of dual solutions and u

Intensification of Heat Transfer during Steam Condensation in Process Condenser of NPP Unit Cooling System

The paper investigates heat transfer during condensation of water vapor on vertical pipes of the process condenser of the cooling system of a nuclear power unit. The numerical study was performed at different mass flow rates of steam in the range of its change from 20 kg/s to 40 kg/s. Intensification of heat exchange is provided by the use of highly efficient heat exchange profiled tubes.

Моделювання процесу охолодження при критичних умовах за рахунок випаровування рідини

Побудовано модель процесу теплообміну в плоскій пластині, з поверхні якої на початковій стадії відведення тепла відбувається лише за рахунок конвекції. В момент, коли температура пластини стає критичною, на поверхню пластини подається рідина, за рахунок випаровування якої відбувається охолодження. Отримано числовий розв’язок модельної задачі. Проаналізовано динаміку тепловідведення та зміну температурного поля пластини.

Heat transfer analysis on magneto–ternary nanofluid flow in a porous medium over a moving surface

Researchers have become attracted with ternary hybrid nanoparticles because of its effectiveness in enhancing heat transfer and have gone on to further analyze the working fluid.  This study is focusing on magneto-ternary nanofluid flow in a porous medium over a moving plate with Joule heating.  The combination of TiO$_2$, SiO$_2$, and Al$_2$O$_3$ with water, H$_2$O, as the based fluid is used for the analysis.

Numerical solutions and stability analysis of unsteady hybrid nanofluid flow over a shrinking sheet with heat generation

The study focuses on the generation of multiple numerical solutions and stability analysis for the case of an unsteady copper-alumina/water hybrid nanofluid subjected to a shrinking sheet.  Heat generation as the potential contributing factor in the heat transfer progress is considered as well as the suction effect.  The governing model (partial differential equations) is developed based on the boundary layer assumptions, which then are transformed into a set of ordinary (similarity) differential equations.  The bvp4c solver is used to search all possible solutions and

Determination and analysis of the thermoelastic state of layered orthotropic cylindrical shells

The fundamental relations of the quasi-static problem of thermoelasticity are written for a finite layered orthotropic cylindrical shell of an antisymmetric structure.  Under convective heat transfer on the surfaces of this shell and under a linear dependence of temperature on the transverse coordinate, the basic system of equations for the integral characteristics of temperature is given.  The method is proposed for solving the formulated problems of thermoelasticity and thermal conductivity, using the double finite integral Fourier transform with respect to the corres

EFFECTIVE WALL STRUCTURES WITH USE OF FLAX STRAW CONCRETE

The modern building technologies are technologies of green construction, near zero-energy and active buildings with bioclimatic design, optimized energy consumption and CO2 emissions. Prospective enclosing structures of such buildings are structures using available, low cost, and environmentally friendly materials based on plant raw materials.

Quasi-static problem of thermoelasticity for layered shallow cylindrical shells of irregular structure

For rectangular layered shallow cylindrical shells of irregular structure, the quasi-static problem of unbound thermoelasticity is formulated.  As a mathematical model, the equations of the shear theory of shallow shells of Timoshenko type are used.  The closed solution for the formulated problem is found by the methods of integral transformations.  The distribution of temperature, displacements, forces and moments in a two-layer cylindrical shell under local convective heating is analyzed numerically.

MHD Nanofluid boundary layer flow over a stretching sheet with viscous, ohmic dissipation

The objective of this research is to examine the steady incompressible two-dimensional hydromagnetic boundary layer flow of nanofluid passing through a stretched sheet in the influence of viscous and ohmic dissipations.  The present problem is obtained with the help of an analytical technique called DTM-Pade Approximation.  The mathematical modeling of the flow is considered in the form of the partial differential equation and is transformed into a differential equation through suitable similarity transformation.  The force of fixed parameters like thermophoresis number