COMBINED EXTENSION AND TORSION OF A UNIFORMLY HEATED CYLINDER OF RUBBERLIKE MATERIAL

1980 ◽  
Vol 3 (2) ◽  
pp. 231-246 ◽  
Author(s):  
C.F.M. Creas
Keyword(s):  
Heated Cylinder ◽  
Rubberlike Material

ESCAPING BUOYANT PLUMES IN THE WAKE OF A HEATED CYLINDER

Equipment ◽  
2006 ◽  
Author(s):  
M. Ren ◽  
C. C. M. Rindt ◽  
Anton A. van Steenhoven
Keyword(s):  
Buoyant Plumes ◽  
Heated Cylinder

scholarly journals Free Convection Heat Transfer from Horizontal Cylinders

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 559
Author(s):  
Janusz T. Cieśliński ◽  
Slawomir Smolen ◽  
Dorota Sawicka
Keyword(s):  
Heat Transfer ◽  
Rayleigh Number ◽  
Free Convection ◽  
Convection Heat Transfer ◽  
Horizontal Tube ◽  
Correlation Equations ◽  
Convection Heat ◽  
Number Range ◽  
Heated Cylinder ◽  
Free Convection Heat

The results of experimental investigation of free convection heat transfer in a rectangular container are presented. The ability of the commonly accepted correlation equations to reproduce present experimental data was tested as well. It was assumed that the examined geometry fulfils the requirement of no-interaction between heated cylinder and bounded surfaces. In order to check this assumption recently published correlation equations that jointly describe the dependence of the average Nusselt number on Rayleigh number and confinement ratios were examined. As a heat source served electrically heated horizontal tube immersed in an ambient fluid. Experiments were performed with pure ethylene glycol (EG), distilled water (W), and a mixture of EG and water at 50%/50% by volume. A set of empirical correlation equations for the prediction of Nu numbers for Rayleigh number range 3.6 × 104 < Ra < 9.2 × 105 or 3.6 × 105 < Raq < 14.8 × 106 and Pr number range 4.5 ≤ Pr ≤ 160 has been developed. The proposed correlation equations are based on two characteristic lengths, i.e., cylinder diameter and boundary layer length.

Numerical study of double diffusive mixed convection around a heated cylinder in an enclosure

2014 ◽  
Vol 78 ◽  
pp. 169-181 ◽  
Author(s):  
Hongtao Xu ◽  
Ruixue Xiao ◽  
Fariborz Karimi ◽  
Mo Yang ◽  
Yuwen Zhang
Keyword(s):  
Mixed Convection ◽  
Numerical Study ◽  
Heated Cylinder ◽  
Double Diffusive

Numerical Study of Boiling Heat Transfer Around Horizontal and Inclined Cylinders

2021 ◽  
Author(s):  
Avik Saha ◽  
Arup Kumar Das
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Horizontal Cylinder ◽  
Uniform Heat Flux ◽  
Cylinder Surface ◽  
Transfer Coefficients ◽  
Heated Cylinder ◽  
Heat Transfer Coefficients ◽  
Stages Of Growth ◽  
Saturated Water

Abstract Pool boiling around a heated cylinder having a diameter larger than the departure diameter of bubbles has been simulated numerically. Thermally uniform heat flux condition has been maintained at the outer surface of the cylinder, submerged at saturated water at atmospheric pressure. Using the Volume of Fluid type framework of liquid phase fraction in the domain, bubble life cycle around the horizontal cylinder has been analyzed to understand different stages of growth, sliding, merging prior to departure. An effort has also been made to characterize the bubble population, emerging from different sites over the cylindrical surface. The influence of cylinder inclination along its axis on these interfacial features has also been discussed using representative numerical simulation. Temperature profiles of the cylinder surface have been portrayed for both horizontal and inclined situations before presenting respective heat transfer coefficients.

Transient flow of viscous compressible fluid past a heated cylinder

2016 ◽  
Vol 5 (3/4) ◽  
pp. 172 ◽  
Author(s):  
Nan Chen ◽  
Fanglin Wang ◽  
Ruifeng Hu ◽  
Nepal C. Roy ◽  
Md. Anwar Hossain
Keyword(s):  
Compressible Fluid ◽  
Transient Flow ◽  
Viscous Compressible Fluid ◽  
Heated Cylinder

scholarly journals Measurement of mean fields in the intermediate wake of a heated cylinder

2020 ◽  
Vol 86 (881) ◽  
pp. 19-00355-19-00355 ◽  
Author(s):  
Hideaki WATANABE ◽  
Hideharu MAKITA ◽  
Makoto TAGO
Keyword(s):  
Heated Cylinder ◽  
Mean Fields

scholarly journals Direct numerical simulation of heat transfer from the stagnation region of a heated cylinder affected by an impinging wake

2011 ◽  
Vol 669 ◽  
pp. 64-89 ◽  
Author(s):  
JAN G. WISSINK ◽  
WOLFGANG RODI
Keyword(s):  
Heat Transfer ◽  
Free Stream ◽  
Three Dimensional ◽  
Stream Velocity ◽  
Stagnation Region ◽  
Stagnation Line ◽  
Vortical Structures ◽  
Free Stream Turbulence ◽  
Heated Cylinder ◽  
Three Dimensional Simulations

The effect of an incoming wake on the flow around and heat transfer from the stagnation region of a circular cylinder was studied using direct numerical simulations (DNSs). Four simulations were carried out at a Reynolds number (based on free-stream velocity and cylinder diameterD) ofReD= 13200: one two-dimensional (baseline) simulation and three three-dimensional simulations. The three-dimensional simulations comprised a baseline simulation with a uniform incoming velocity field, a simulation in which realistic wake data – generated in a separate precursor DNS – were introduced at the inflow plane and, finally, a simulation in which the turbulent fluctuations were removed from the incoming wake in order to study the effect of the mean velocity deficit on the heat transfer in the stagnation region. In the simulation with realistic wake data, the incoming wake still exhibited the characteristic meandering behaviour of a near-wake. When approaching the regions immediately above and below the stagnation line of the cylinder, the vortical structures from the wake were found to be significantly stretched by the strongly accelerating wall-parallel (circumferential) flow into elongated vortex tubes that became increasingly aligned with the direction of flow. As the elongated streamwise vortical structures impinge on the stagnation region, on one side they transport cool fluid towards the heated cylinder, while on the other side hot fluid is transported away from the cylinder towards the free stream, thereby increasing the heat transfer. The DNS results are compared with various semi-empirical correlations for predicting the augmentation of heat transfer due to free-stream turbulence.

Fluctuating Temperature Measurements on a Heated Cylinder Placed in a Cylinder Near-Wake

2004 ◽  
Vol 126 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Z. J. Wang ◽  
Y. Zhou ◽  
X. W. Wang ◽  
W. Jin
Keyword(s):  
Hot Wire ◽  
Heat Transfer Characteristics ◽  
Near Wake ◽  
Heated Cylinder ◽  
Fbg Sensor ◽  
Vortex Shedding Frequency ◽  
Sensor Measurement ◽  
Shedding Frequency ◽  
Good Agreement ◽  
Pronounced Peak

The local time-averaged temperature θs¯ and its fluctuating component θs on the surface of a heated circular cylinder immersed in a cylinder near-wake were measured using a fiber-optic Bragg grating (FBG) sensor. Three cylinder center-to-center spacing, i.e., L/d=5.20, 2.50, and 1.18, were investigated. In order to validate the FBG sensor measurement, a thermocouple and a single hot-wire were employed to measure θs¯ on the heated cylinder and streamwise fluctuating velocity u in the near-wake of the downstream cylinder, respectively. The FBG sensor measurement of θs¯ is in good agreement with that simultaneously obtained by the thermocouple. The measured θs is closely correlated to the hot-wire measurement; the θs-spectrum exhibits a pronounced peak at the vortex shedding frequency, as identified in Eu, for each L/d. The results suggest that the FBG sensor can be used to measure reliably both time-averaged and fluctuating temperatures. The heat transfer characteristics of the heated cylinder are examined for different L/d and further compared with the case of an isolated cylinder.

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