2 edition of **effect of oscillation and gas content on free convection from horizontal cylinders in water** found in the catalog.

effect of oscillation and gas content on free convection from horizontal cylinders in water

Vernon Hugo Swanson

- 228 Want to read
- 28 Currently reading

Published
**1963** .

Written in English

- Heat -- Convection.,
- Hydrodynamics.

**Edition Notes**

Statement | by Vernon Hugo Swanson. |

The Physical Object | |
---|---|

Pagination | 54 leaves, bound : |

Number of Pages | 54 |

ID Numbers | |

Open Library | OL14332110M |

Effect of variable viscosity on vortex instability of non-Darcy free convection boundary layer flow adjacent to a non-isothermal horizontal surface in a porous medium 27 February | Boundary Value Problems, Vol. , No. 1. And how much power would the water carry away from the cylinder (e.g. by surface gravity waves) if it were started oscillating and set free? This could be approximated by a damping term where the oscillating cylinder undergoes damped harmonic oscillation. Augmentation techniques can be classified either as passive methods, which require no direct application of external power (), or as active methods, which require external effectiveness of both types of techniques is strongly dependent on the mode of heat transfer, which may range from single-phase free convection to dispersed-flow film boiling. natural convection in a finite length horizontal cylinder are developed and constructed in finite difference form. The boundary conditions con-sist of radial heat flux for a specified thermal resistance, axial heat flux from one closed end and three different conditions at the other end to represent exposure to a hot convecting gas environment.

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The effect of oscillation and gas content on free convection from horizontal cylinders in waterAuthor: Vernon Hugo Swanson. An experimental study of steady state free convection heat transfer from horizontal cylinder with inclined duct is carried out.

An experiment was conducted to investigate the effect. @article{osti_, title = {FREE CONVECTION HEAT TRANSFER TO HORIZONTAL CYLINDERS FROM AN ORDINARY FLUID CONTAINING A VOLUME HEAT SOURCE (thesis)}, author = {de Guzman, J P}, abstractNote = {Outside heat transfer coefficients for several horizontal tubes cooling an ordinary fluid containing a volume heat source by free convection.

The research described here is concerned with natural convection from isothermal cylinders, with a particular focus on the interaction between a pair of vertically aligned cylinders.

Prime attention was focused on how the local heat transfer characteristics of the upper cylinder are affected due to buoyancy induced fluid flow from the lower Cited by: 3. The oscillatory free convection about a horizontal circular cylinder in a Newtonian fluid in the presence of heat generation is investigated numerically by using the finite difference method.

The surface temperature of the cylinder oscillates harmonically about the temperature of the surrounding medium. Heat is generated internally within the Newtonian fluid at a rate Author: Najahulfazliah Zainuddin, Muhaimin Ismoen, Rozaini Roslan, Ishak Hashim. Particle image velocimetry measurements were obtained in the free convection water flow around a heated horizontal cylinder for a Rayleigh number of ×× and a.

Atmane et al. [] investigated experimentally the effect of vertical confinement on a single heated horizontal cylinder for a range of Rayleigh number between 3 × 10 4 and 3 × 10 6 in concluded that effect of oscillation and gas content on free convection from horizontal cylinders in water book heat transfer nearby the cylinder and the natural convection hydrodynamics was not affected by the water surface if the distance was four times the.

Fig however, shows a representative comparison between observations and predictions of free convection from a heated horizontal cylinder in water. Fig.

Typical comparison between the predictions (lines) [] and experimental (symbols) [] results on free convection from a horizontal cylinder in water. Results show that the heat transfer coefficient can be significantly increased by the oscillation of the cylinder.

Two effects that enhance the heat transfer performance are found, namely, the lock-on effect and the turbulence effect. A maximum of 34 percent increase in heat transfer is found within the parameter ranges considered in this study. For laminar free convection, m = 1 / 4 irrespective of the shape of the object losing heat, so Nu is proportional to (T s-T) 1 / 4.

In this case, the rate of convective heat loss Eq. () is proportional to (T s-T) 5 / 4, the so-called five-fourths power law of cooling by free convection.

Heat transfer coefficient, heat convected and heat radiated from an isothermal horizontal cylinder assuming natural convection. The convection calculation is based on Rayleigh number and is valid for Rayleigh numbers between and. horizontal heated cylinders under natural convection conditions in water.

This experimental study considers the influence of Rayleigh number and cylinder spacing. The range of Rayleigh numbers from 2 x to 6 x and cylinder spacings of s/D = to 3 studied is a common range that is found in many tube bundle heat exchangers. [2] M Ashjaee, S Yazdani and S Bigham.

Experimental and numerical investigation on free convection from a horizontal cylinder located above an adiabatic surface. Heat Transfer Engineering, 33(3)–, [3] T F Smith, C Beckermann and S W Weber.

Combined conduction, natural convection and radiation heat transfer in an electronic chassis. When a horizontal cylinder or sphere with temperature T w is immersed in a fluid with temperature T ∞ (), a boundary layer develops along the curved boundary layer thickness is a function of the angle φ (is at the bottom of the cylinder or sphere), as shown in Fig.

The similarity solution that worked for the case of the vertical plate does not work for natural convection. This paper deals with the problem of combined (forced and natural) convection from a horizontal cylinder performing oscillating rotary motion in a quiescent fluid of infinite extent.

While forced convection is caused by cylinder oscillation, the natural convection is caused by the buoyancy driven flow. The heat transfer process is governed by Rayleigh number, Ra. Without effect of the internal heat generation inside the fluid domain for which we take γ =the present numerical results show an excellent agreement with those of Merkin [J.H.

Merkin, Free convection boundary layer on an isothermal horizontal circular cylinders, in: ASME/AIChE, Heat Transfer Conference, St. Louis, MO, August 9–11, ]. A theoretical investigation was conducted by (Badr & Denis, ) to evaluate the effect of rotation on the convective heat transfer process from a rotating cylinder (Hessami, De Vahl Davis, Leonardi & Reizes, ) and (Ho & Tu, ) have studied numerically the laminar mixed convection for air and water respectively contained in vertical.

in water-boiler types of nuclear re- actors. Nevertheless natural convec- tion, particularly in enclosed spaces, has been a relatively neglected field of investigation. Apparently natural convection in a horizontal cylinder has been studied experimentally only by Ostroumov (l), who discussed the determination.

This page calculates the heat transfer coefficient, heat convected and heat radiated from an isothermal horizontal cylinder assuming natural convection. The convection calculation is based on Rayleigh number and is valid for Rayleigh numbers between and 10 The ends of the cylinder are assumed to be adiabatic.

Free Convection on Vertical Planes and Cylinders UniformWall Temperature UniformWall Heat Flux Free Convection on a Horizontal Plate Effects of Turbulence Free Convection fromInclined Surfaces Free Convection on Inclined Cylinders Free Convection on a Sphere Simplified Equations for Air 5.

Abstract. The convective instability of a fluid that fills a horizontal cylindrical cavity is considered. The boundaries of the cavity are conducting, and the driving force is a linear temperature gradient far from the cylinder. Critical Rayleigh numbers governing the onset of convection are determined for neutral stability.

transfer from inclined cylinders: a unified correlation. This work stipulates an empirical correlation for predicting the heat transfer coefficient for a cylinder under free convection, inclined at any arbitrary angle with the horizontal has been developed in terms of Nusselt number, Prandtl number and Grashoff number.

presentation of heat exchange is that of Kern’s unique book; certainly simpler, but at the same time broader in approach. Wrestling with problems is. horizontal cylinders horizontal planes Forced Convection Forced Three States of Water phase diagram for water vapour pressure/temperature curve for water Heat Requirements for Vaporization Heat Transfer in Drying Dryer Efficiencies ABOUT THE BOOK.

and magnetohydrodynamic effects on the stagnation point flow towards a stretching sheet. Motivated by the above contributions, the purpose of the present study is to investigate the free convection boundary layer flow towards a horizontal circular cylinder in a nanofluid by including the viscous dissipation effect.

An experimental investigation of natural convection from a staggered array of isothermal horizontal cylinders, 8th World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics, Lisbon, Portugal, JuneConference Paper, TARA - Full Text.

Free Convection: Mixed Convection Mixed Convection • a condition where both free and forced convection effects are comparable • free convection can assist, oppose, or act orthogonally to forced convection € buoyancy force inertial force ~ Gr L Re L 2 >>1 O(1) free convection dominates mixed convection condition forced.

Fand, R.M. The influence of acoustic vibrations on heat transfer by natural convection from a horizontal cylinder to water. Heat Transf.87, – [Google Scholar] West, F.B.; Taylor, A.T. The effect of pulsations on heat transfer-turbulent flow of water inside tubes.

Chem. Eng. Prog. 48, 39– [Google Scholar]. A comparison is presented between the predicted and measured temperature and velocity fields above a horizontal cylinder in natural convection.

This is repeated for a second cylinder operating at the same Grashof number to confirm the non-dimensional scaling. The cylinders were centered in an isothermal cubical enclosure with water cooled walls.

units free convection heat transfer coefficient calculator. so how what is a formula to show that it is passed or failed using 1. The coordinates used in spherical coordinates are rho, theta, and phi.

Procedure: 1) Find the mass of the empty graduated cylinder. Cylinders are very common, from cans to tubes, to internal combustion engines. (6) Vertical Cylinders. (7) Horizontal Cylinders. (8) Spheres. Free Convection in Enclosures (1) Vertical Rectangular Enclosures.

(2) Horizontal Rectangular Enclosures. (3) Inclined Rectangular Enclosures. Other Correlations • Keep in mind that this chapter presents correlation equations for very limited processes and configurations.

The effect of the periodic oscillation of the surface temperature on the transient free convection from a vertical plate is investigated by Saeid [7]. It is found that increasing the amplitude and the frequency of the oscillating surface temperature will decrease the free convection heat transfer from the plate in respect of both air and water.

The. Abstract: Convection in an internally heated magnetic fluid is analyzed for rigid – rigid and rigid – free boundary surfaces with zero temperature at top and no heat flux at the lower surface. Linear stability analysis is performed for a variety of internal heat source models and the corresponding Eigen value problem is solved by Chebyshev.

The average Nusselt number for flow across cylinders can be expressed compactly as. where n = 1 and the experimentally determined constants C and m are given in Table 19–2 for circular as well as various noncircular characteristic length D for use in the calculation of the Reynolds and the Nusselt numbers for different geometries is as.

We study the problem of thermal convection in a laterally heated horizontal cylinder rotating about its axis. A cylinder of aspect ratio Gamma = H/2R = 2 containing a small Prandtl number fluid (sigma = ) representative of molten metals and molten semiconductors at high temperature is considered.

We focus on a slow rotation regime (Omega effects. would transit from forced convection to mixed convection. Parallel flow Ri > Horizontal flow Ri > degrees Ri > Contra flow Ri > More detailed studies about the effect of buoyancy on the vortex shedding in the wake of a heated cylinder in mixed convection regime were carried out slightly later, and some.

This paper discusses the close interaction between local fluid dynamics and natural convection heat transfer from a pair of isothermally heated horizontal cylinders submerged in water. The presence of a second heated cylinder induces heat transfer enhancements of up to 10%, and strong fluctuations in local heat transfer rate.

ME - Heat Transfer Laboratory Experiment No. 8 FORCED CONVECTION FROM A CIRCULAR CYLINDER SUBJECTED TO CROSS FLOW Nomenclature As surface area of cylinder (m2) D diameter of cylinder (m) h overall heat transfer coefficient (W/m 2K) k thermal conductivity (W/mK) L length of cylinder (m) Nu Nusselt number (-) q amount of heat.

OSCILLATION OF CYLINDERS IN OR BELOW THE FREE SURFACE OF DEEP FLUIDS by W. Frank ABSTRACT The subject of cylinders oscillating in or below the free surface of very deep fluids is developed as a boundary value problem within the framework of linenw free-surface theory by distributing source singularities over the sub.

techniques involving horizontal cylindrical geometries. In addition, including rotation increases the interest of the conﬁguration, due to the two competing mechanisms at stake that may result in a richer dynamical phenomenology.

The numerical works addressing the study of convection in a rotating horizontal cylinder are scarce. The. Forced convection: External Flows: Concepts about hydrodynamic and thermal boundary layer and use of empirical correlations for convective heat transfer -Flat plates and Cylinders.

Free Convection: Development of Hydrodynamic and thermal boundary layer along a vertical plate – Use of empirical relations for Vertical plates and pipes.Free Convection 6 Free Convection [2] • Buoyancy is the result of difference in density between materials.

• In this case, the difference in density is due to the difference in temperature. • In the figure, the air next to the plate is heated, its density decreases, and .Horizontal concentric, eccentric and arrays of cylinders within the outer cylinder are geometries included in the correlation.

AB - Correlating equations for heat transfer by natural convection from horizontal cylinders to a cylindrical enclosure are obtained using a .