The Influence of Interfacial Heat Exchange on Temperature Distribution in Horizontal Well with Stratified Flow

2016 ◽  
Vol 2 (1) ◽  
pp. 10-18
Author(s):  
Ramil F. Sharafutdinov ◽  
Timur R. Khabirov ◽  
Nadezhda V. Novoselova
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Horizontal Well ◽  
Stratified Flow

scholarly journals Thermal condition of cohesion in a two-layer roll of a rolling mill

2019 ◽  
pp. 45-48
Author(s):  
Olga Panteleivna Demyanchenko ◽  
Viktor Lyashenko
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Heat Conductivity ◽  
Rolling Mill ◽  
Thermal Condition ◽  
Thermal Contact ◽  
Homogeneous Equation ◽  
Target Setting ◽  
Radial Section ◽  
Ideal Thermal Contact

A condition of heat exchange between the layershaving different thermalphysic properties in a two-layercylindrical roll of a rolling mill is analyzed foe an ideal thermalcontact. It can be realized with application of the condition ofheat balance of one of the layers in the cylindrical area for ahomogeneous equation of heat conductivity. Analyzed was asimplified target setting in the radial section with a supposition,regarding an averaged in radius temperature distribution in theouter layer. By applying the condition of the thermal balance andby integrating the homogeneous equation of heat conductivity inthe two-layer area a condition of cohesion of an impedance typein case of an ideal thermal contact between the layers wasconstructed.

Two-dimensional finite difference model to study temperature distribution in SST regions of human limbs immediately after physical exercise in cold climate

2015 ◽  
Vol 04 (01) ◽  
pp. 1550002
Author(s):  
Babita Kumari ◽  
Neeru Adlakha
Keyword(s):  
Thermal Stress ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Finite Difference ◽  
Physical Exercise ◽  
Peripheral Region ◽  
Cold Climate ◽  
The Body ◽  
Cylindrical Shape ◽  
Two Dimensional

Thermoregulation is a complex mechanism regulating heat production within the body (chemical thermoregulation) and heat exchange between the body and the environment (physical thermoregulation) in such a way that the heat exchange is balanced and deep body temperatures are relatively stable. The external heat transfer mechanisms are radiation, conduction, convection and evaporation. The physical activity causes thermal stress and poses challenges for this thermoregulation. In this paper, a model has been developed to study temperature distribution in SST regions of human limbs immediately after physical exercise under cold climate. It is assumed that the subject is doing exercise initially and comes to rest at time t = 0. The human limb is assumed to be of cylindrical shape. The peripheral region of limb is divided into three natural components namely epidermis, dermis and subdermal tissues (SST). Appropriate boundary conditions have been framed based on the physical conditions of the problem. Finite difference has been employed for time, radial and angular variables. The numerical results have been used to obtain temperature profiles in the SST region immediately after continuous exercise for a two-dimensional unsteady state case. The results have been used to analyze the thermal stress in relation to light, moderate and vigorous intensity exercise.

CFD-Based Study of Velocity and Temperature Distribution among Rib-Tube in Heat Environment

2014 ◽  
Vol 487 ◽  
pp. 558-561
Author(s):  
Su Hou De ◽  
Zhang Yu Fu ◽  
Che Ji Yong ◽  
Wu Shi Lei ◽  
Xiao Long Wen
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Velocity Distribution ◽  
Engineering Application ◽  
Dispersed Phase ◽  
Wall Function ◽  
Governing Equations ◽  
Theory Analysis

The velocity distribution coupled thermal and fluid flow a rib-tube was studied in this article. Based on theory analysis and numerical simulation, we choose modal and wall function to simulate the flow in rib-tube, velocity to definite the dispersed phase. The governing equations were built and solved by numerical way. The progress of flow and heat exchange in rib-tube, the rules and contours of temperature, velocity were obtained, they shows that, along the rib-tube, velocity was changed with the temperature rising , which could give us a reference for engineering application .

Simulation and Research of a Thermal Type Liquid Flow Sensor

2012 ◽  
Vol 562-564 ◽  
pp. 1213-1217
Author(s):  
Feng Tian ◽  
Zhen Bin Gao ◽  
Yi Cai Sun
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Flow Sensor ◽  
Turbulent Heat Transfer ◽  
Turbulent Heat ◽  
Water Flow Velocity ◽  
Detection Circuit ◽  
Flow Detection

A flow sensor for liquids, based on the principle of fluid-structure heat transfer is presented. The heater and thermistor are integrated and wrapped together as a detector and heat source, allowing heat exchange between the sensor and the fluid. Through numerical simulation, the temperature distribution of the sensor was investigated, under conditions of various flow velocities. The process of turbulent heat transfer in the flow pipe was simulated, the temperature distribution in the sensor was analyzed and compared under different temperature and velocity of the fluid, and the corresponding measuring ranges were determined. The flow detection circuit is designed and the results of water flow velocity tests in the range of (0.01–1)m/s are presented.

scholarly journals A New Design for Wood Stoves Based on Numerical Analysis and Experimental Research

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1028
Author(s):  
Przemysław Motyl ◽  
Marcin Wikło ◽  
Julita Bukalska ◽  
Bartosz Piechnik ◽  
Rafał Kalbarczyk
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Experimental Research ◽  
Test Bench ◽  
Wood Stove ◽  
Average Temperature ◽  
Second Stage ◽  
Fluent Software ◽  
Two Stages ◽  
Wood Stoves

This work proposes a comprehensive approach to modifying the design of wood stoves with a heating power up to 20 kW, including design works, simulations, and experimental research. The work is carried out in two stages. In the first part, a numerical model is proposed of the fireplace insert including fluid flow, the chemical combustion reaction, and heat exchange (FLUENT software is applied to solve the problem). The results of the simulation were compared with the experiment carried out on the test bench. A comparison of the experimental and numerical results was made for the temperature distribution along with the concentration of CO, CO2, and O2. Construction changes were proposed in the second stage, together with numerical simulations whose goal was an increase in the efficiency of the heating devices. The results obtained show that the average temperature in the chimney flue, which has a low value that is a determinant of the higher efficiency of the heating devices, was reduced relative to the initial design of the fireplace intake by 11%–16% in all cases. The retrofit enhanced stable heat release from the wood stove, which increased the efficiency and reduced the harmful components of combustion.

scholarly journals Research of temperature distribution in rooms with radiant heating systems

2018 ◽  
Vol 194 ◽  
pp. 01061 ◽  
Author(s):  
Ivan Voloshko ◽  
Vasiliy Ushakov
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Working Conditions ◽  
Temperature Measurements ◽  
Radiant Heating ◽  
Heating Systems ◽  
Closed Type ◽  
Infrared Emitter

The results of temperature measurements in model rooms of a closed type with a system of radiant heating are presented. The temperatures of different designs' surfaces in large-sized rooms, heated by a gas infrared emitter of light type, are established. Conclusions are drawn about the mechanism of the medium's heating, depending on the conditions of heat exchange, and also on providing worker's comfortable working conditions, when the medium is heated by a gas infrared emitter.

Modeling of Fine Annealing of Large Size Optical Glass

2013 ◽  
Author(s):  
Yefeng Ma ◽  
Nan Wu ◽  
Lihua Li ◽  
Song Zhang ◽  
Lili Zheng ◽  
...  
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Temperature Difference ◽  
Optical Glass ◽  
Maximum Temperature ◽  
Glass Temperature ◽  
Insulation Layer ◽  
Large Size ◽  
Fine Annealing

Large size optical glass has attracted much attention due to its applications in large optical devices. Due to stringent requirement in applications, extra thermal treatment should be investigated to increase the quality of product. During fine annealing, glass temperature is crucial for final quality of optical glass as a result of its influence on thermal stress and optical homogeneity. To ensure a high performance, temperature distribution in the glass should be homogeneous and symmetric, and maximum temperature difference is expected to be small. This paper proposed two approaches to improve the glass temperature uniformity during fine annealing. Firstly, the glass blocks are packaged with heat exchange blocks on the top and bottom surfaces and insulation layer on the side. Thickness of layers and materials usage are investigated. Simulation results show that the homogeneity and symmetry of glass temperature distribution can be improved. Temperature difference in the horizontal direction can be further reduced in the case of 10mm copper heat exchange block together with 50mm insulation layer. Secondly, a muffle apparatus is utilized and symmetry of temperature distribution can be improved. Furthermore, above two approaches can be combined. Knowledge learned in this work can be used to guide industrial fine annealing process to reduce the stress level and improve the symmetric of residual stress.

Laminar and Turbulent Natural Convection Simulation with Radiation in Enclosure

2016 ◽  
Vol 818 ◽  
pp. 3-11
Author(s):  
M. Hussen Hasanen ◽  
Hussein J. Akeiber
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Convective Heat ◽  
Convective Heat Exchange ◽  
Turbulent Natural Convection ◽  
Heating Efficiency ◽  
Partial Heating ◽  
Different Types ◽  
Floor Heating

Several features of heat transfer on enclosing surfaces are discussed including temperature distributions in a room heated by a floor heater. Numerical analyses on radiative and convective heat transfer were carried out against several partial floor heating. Partial floor heating produces different types of temperature distribution between the heated and non-heated places, which is a remarkable characteristics found out in this study. In the heated places, the temperature distribution is almost the same as that of typical floor heating. However, in the non-heated places, air temperature differs by 6 °C (3.6 °Difference) between a point near the floor surface and a point well above that. Heating efficiency of partial heating slightly depends on the set place as well as its Area. Moreover, convective heat exchange constitutes approximately half of the total heat exchange

A Solution for the Temperature Distribution in a Pipe Wall Subjected to Internally Stratified Flow

1990 ◽  
Vol 112 (4) ◽  
pp. 602-606 ◽  
Author(s):  
W. R. Smith ◽  
D. S. Cassell ◽  
E. P. Schlereth
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Pipe Wall ◽  
Stratified Flow ◽  
Physical Situation ◽  
Cylindrical Coordinates ◽  
One Dimensional ◽  
Fourier Cosine ◽  
Dimensional Approximation

Stratified flow in a pipe is a phenomenon in which two distinct fluids flow simultaneously through a pipe with little or no mixing. Under certain conditions the flow stratification will result in a dramatic temperature variation within the pipe wall. This paper presents a solution for the temperature distribution in a pipe wall subjected to internally stratified flow by solving Laplace’s equation in cylindrical coordinates using a finite Fourier cosine transform. The top and bottom sections are treated separately and coupled by boundary conditions at the interface. A one-dimensional approximation for the temperature distribution in the pipe at the interface is developed to uncouple the top and bottom sections, thereby avoiding the necessity for simultaneous solution of two partial differential equations. Results from the solution for a case study of a particular physical situation were compared to the solution obtained using the ANSYS finite element computer program. The solution agreed with the finite element solution to within approximately 2.4 percent throughout the pipe wall and was within 0.4 percent for most of the pipe.

scholarly journals The influence of the length of heat sources on the external border on the temperature distribution in profiled polar-orthotropic ring plates taking into account there heat exchange with the external environment

2020 ◽  
pp. 86-91
Author(s):  
Uladzimir V. Karalevich ◽  
Dmitrij G. Medvedev
Keyword(s):  
Heat Exchange ◽  
Temperature Distribution ◽  
Heat Conduction Problem ◽  
External Environment ◽  
Heat Sources ◽  
Stationary Heat ◽  
Annular Plates ◽  
Outer Border ◽  
Polar Orthotropic ◽  
Account Heat

We study the influence of N extended heat sources at external boundaries on the nonaxisymmetric temperature distribution on profiled polar-orthotropic ring plates and take into account heat exchange with the external environment. The solution of the stationary heat conduction problem for anisotropic annular plates of a random profile is resolved through the solution of the corresponding Volterra integral equation of the second kind. The formula of a temperature calculations in anisotropic annular plates of an random profile is given. The exact solution of stationary heat conductivity problem for a reverse conical polar-orthotropic ring plate is recorded. The temperature distribution in such anisotropic plate from N extended heat sources at its outer border is more complex than in the case of temperature distribution from N point heat sources at their external border.

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