Comparison of the Effects of Straight and Twisted Heat Trace Installations Based on Three-dimensional Unsteady Heat Transfer

2016 ◽  
Vol 30 (1) ◽  
pp. 49-56
Author(s):  
Myoung-Young Choi ◽  
Byoung-Jin Jeon ◽  
Hyoung-Gwon Choi
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Unsteady Heat Transfer ◽  
Heat Trace

scholarly journals UNSTEADY HEAT TRANSFER IN A HORIZONTAL GROUND HEAT EXCHANGER

2018 ◽  
Vol 40 (4) ◽  
pp. 34-40
Author(s):  
B.I. Basok ◽  
B.V. Davidenko ◽  
I.K. Bozhko ◽  
M.V. Moroz
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Three Dimensional ◽  
Heat Transfer Agent ◽  
Ground Heat Exchanger ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Unsteady Heat Transfer ◽  
Pump System ◽  
Heat Pump System

By the three-dimensional model of heat transfer in the system "ground - horizontal ground heat exchanger - heat transfer agent", an analysis of the efficiency of the horizontal multi-loop heat exchanger, which is an element of the heat pump system, was carried out. Based on the results of numerical simulation, the time dependence of the heat transfer agent temperature at the outlet from the ground heat exchanger and the amount of heat extracted from the ground is determined. The results of calculations by the presented model are satisfactorily agree with the experimental data.

A Transient Flow Facility for the Study of the Thermofluid-Dynamics of a Full Stage Turbine Under Engine Representative Conditions

1988 ◽  
Author(s):  
R. W. Ainsworth ◽  
D. L. Schultz ◽  
M. R. D. Davies ◽  
C. J. P. Forth ◽  
M. A. Hilditch ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Transient Flow ◽  
Three Dimensional ◽  
Unsteady Heat Transfer ◽  
Mode Of Operation ◽  
The Future ◽  
Work Programme ◽  
Shock Simulation ◽  
Future Work ◽  
Design And Construction

The design and construction of a new experiment, to investigate the steady and unsteady heat transfer and aerodynamic behaviour of a rotating turbine in a transient facility, is described. The need for this experiment is discussed in the context of previous rotating bar wake and shock simulation work carried out in the Oxford transient cascade facility, and research elsewhere on the effects of rotating and three-dimensional flowfields on turbine aerodynamics and heat transfer. The outline concept and mode of operation of the turbine module are given before novel features of the design are presented in detail. Reference is made to a parallel paper also presented at this conference[18] which gives full details of the developments that have been necessary to allow the measurement of steady and unsteady heat transfer in this facility. Finally, the future work programme and possible plans for further facility improvements are given.

Moving and Rotating Sphere in the Thermal Entrance Region of a Heated Pipe

1999 ◽  
Vol 122 (2) ◽  
pp. 336-344 ◽  
Author(s):  
N. Shahcheraghi ◽  
H. A. Dwyer
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Entrance Region ◽  
Lumped Mass ◽  
Unsteady Heat Transfer ◽  
Rotating Sphere ◽  
Drag Forces ◽  
Thermal Entrance Region ◽  
Lift And Drag ◽  
Thermal Entrance

Flow and unsteady heat transfer around a moving and rotating sphere is considered as it passes through the thermal entrance region of a heated pipe. The flow is incompressible and viscous with constant properties, and the heated pipe wall is kept at a constant temperature. Two Peclet numbers of 25 and 100 are considered along with two sphere-to-pipe-diameter ratios of 0.2 and 0.4. The flow is made three dimensional by an eccentric positioning of the sphere inside the pipe. The governing equations are solved by a validated numerical method which uses a finite volume formulation in a generalized body-fitted coordinate system. An overset (Chimera) grid scheme is used to resolve the two geometries of the pipe and sphere. The results are presented in terms of the steady pressure and viscous lift and drag forces on the sphere. In addition the unsteady heat transfer characteristics of the flow are presented in terms of the local and overall Nusselt number evolution around the sphere as it passes through the thermal entrance region of the pipe. Sphere heat-up is also given as the lumped mass sphere temperature as a function of distance from the thermal entrance. [S0022-1481(00)02402-6]

scholarly journals Three-dimensional unsteady heat transfer analysis of an indirect heating furnace with a bolts-packed work.

1990 ◽  
Vol 16 (2) ◽  
pp. 204-210
Author(s):  
Hiroyuki Ito ◽  
Yoshito Umeda ◽  
Yasuhisa Nakamura ◽  
Tetsuo Watanabe ◽  
Takaaki Mizutani ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Three Dimensional ◽  
Heating Furnace ◽  
Heat Transfer Analysis ◽  
Unsteady Heat Transfer ◽  
Indirect Heating

Analysis of Heat Conduction Mechanism on Tympanites Roadbed

2013 ◽  
Vol 838-841 ◽  
pp. 1286-1290
Author(s):  
Jian Yi Yuan ◽  
Jian Hua Cheng ◽  
Chun Feng Wang ◽  
Ding Bang Zhang ◽  
Zhen Hua Wu
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Conduction Mechanism ◽  
Soil Layer ◽  
Three Dimensional ◽  
Entropy Change ◽  
Frozen Soil ◽  
Second Law ◽  
Two Dimensional ◽  
Unsteady Heat Transfer

In order to reveal the heat conduction direction on roadbed, a series of theoretical analysis and mathematical derivations are used. Through simplifying the frozen soil layer as an equivalent homogeneous frozen body, the physical model of heat conduction was founded. Also, applying the entropy change of the thermodynamics second law, the direction of the actual heat transfer was analyzed. Further more, the three-dimensional and two-dimensional differential equation of unsteady heat transfer in Cartesian model were obtained by using Fourier's Law and importing the micro unit. It has significant senses for deep research of roadbed tympanites.

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