Cover of: Investigation of heat transfer in a vertical annulus | Thomas E. Burt

Investigation of heat transfer in a vertical annulus

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Naval Postgraduate School , Monterey, California
Mechanical engine
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Experimental investigation of heat transfer in a vertical annulus with a bottom heated rotating inner cylinder Muhammad F.

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Ejaz * | Shehryar Manzoor Mechanical Engineering Department, University of Engineering & Technology, TaxilaPakistan. Abstract In advanced water cooled reactors, an annular gap exists between pressure tube and calandria tube. The gap is closed from top but is open from bottom. Due to differential temperature between pressure tube and calandria tube, air flow is induced by natural convection.

This leads to heat transfer from pressure tube to calandria tube. The quantification of the heat transfer between Cited by: 1. On the basis of works conducted before, experiments of the convection heat transfer are carried out in the horizontal and vertical narrow annulus with the Reynolds number raging from 10 to 30, Heat transfer characteristics of water flow in the narrow annulus are by: The present study aimed to investigate the local and average heat transfer along the axial distance of outer cylinder in horizontal and vertical positions.

The experimental setup consists of an. The heat exchanger used consisted of a straight tube in tube test section with water as the heat transfer medium in both tubes „ Convection coefficients of heat transfer between the inner tube and the fluid flowing in the annulus were determined from the measured inner tube wall and average fluid bulk temperature and the energy transferred to Author: Thomas E.

Burt. The natural convection heat transfer of Investigation of heat transfer in a vertical annulus book in the annulus has strong influence with the CO 2 inlet temperature, pressure, mass flow rate, and the heat flux.

To investigate the effect of these parameters on the natural convection characteristics, different CO 2 inlet parameters and heat fluxes. The problem of vertical annular porous cylinder which can act as a duct was studied by Badruddin et al., by applying thermal equilibrium as well as thermal non-equilibrium approach by having inner radius heated and outer radius cooled isothermally.

The various physical and geometrical aspects affecting the heat transfer was discussed in detail.

Details Investigation of heat transfer in a vertical annulus EPUB

In heat exchangers and heated solenoids, the annular structure is widely used and it often transfers heat through natural convection.

So, the heat-transfer characteristics of the annular structure are numerically studied in the range of 10 ≤ R a ≤ 5 × 10 5 in this paper.

The chimney effect and. Experimental investigation on the natural convection heat transfer in the vertical annulus of a CO2 injection well under steady-state conditions. effective heat transfer length of about 6 m and was operated in a counter flow arrangement with hot water in the inner tube and cold water in the annulus.

This study reports numerical investigation of natural convection in a vertical annular cavity filled with fluid-saturated porous media. The inner and outer walls are subjected to two spatially.

Description Investigation of heat transfer in a vertical annulus FB2

convection heat transfer process in the vertical annulus with rotating inner cylinder. Therefore, the present study aimed to investigate experimentally the behavior of the heat transfer process by mixed convection in the vertical and horizontal positions for uniformly.

The annulus represents a common geometry employed in a variety of heat transfer systems, ranging from a simple heat exchanger to the most complicated nuclear reactors[Sankar and Younghae ()].

Numerical studies have been performed by many researchers on the internally heated vertical annulus. Experimental investigation on the natural convection heat transfer in the vertical annulus of a CO 2 injection well under steady-state conditions International Journal of.

Heat transfer measurements are presented for free convection in a vertical annulus wherein the inner cylinder is at constant surface heat flux and the outer cylinder is at constant temperature. The special fluid flow and heat transfer characteristics of supercritical CO 2 in a vertical annular channel have been numerically investigated.

The AKN k - ε model was selected to model the turbulent flow and heat transfer of supercritical fluid. A numerical investigation on natural convective heat transfer of nanofluid (Al 2 O 3 +water) inside a partially heated vertical annulus of high aspect ratio () has been carried out.

The computational fluid dynamics solver Ansys Fluent is used for simulation and results are presented for various volume fraction of nanoparticles (0‐) at different heat flux values (3‐12 kW/m 2).

Numerical investigation of natural convection heat transfer from vertical cylinder with annular fins Article in International Journal of Thermal Sciences (January)– January Experimental investigations of turbulent heat transfer are made in a large-gap annulus with both rotating and nonrotating inner cylinder.

The vertical annular channel has an electrically heated outer wall; the inner wall is thermally and electrically insulated. The axial air flow is allowed to develop before rotation and heating are imparted. Experimental investigation on the natural convection heat transfer in the vertical annulus of a CO 2 injection well under steady-state conditions Author links open overlay panel Xiaolu Li a Peixue Jiang a Ruina Xu a Lingli Wei bCited by: 6.

The present study is novel because it appears to be the first paper on the analytical hydrodynamic analysis of forced oscillated vertical annular fluid flow.

The present investigation has possible applications in moderate sized wicked heat pipes, solid matrix compact heat exchangers compromising of metallic foams (in some other types of heat exchengers as well), possibly in boilers, filtration equipment, and. Experimental investigation of natural convection heat transfer in horizontal and inclined annular fluid layers Article (PDF Available) in Heat and Mass Transfer 44(8) June with Prasad, V.

and Kulacki, F.A., a, “Natural convection in a vertical porous annulus”, Int. Heat Mass Transfer, 27, – Google Scholar Prasad, V.

and Kulacki, F.A., b, “Convective heat transfer in a rectangular porous cavity-Effect of aspect ratio on flow structure and heat transfer”, J. Heat Transfer,–   In the petroleum industry, downward two-phase in annulus is encountered on Liquid Assisted Gas-Lift (LAGL) unloading and production operations.

This study presents experimental data for pressure gradient, liquid holdup, and flow regimes for vertical downward two-phase (air and water) flow in pipe annulus. developed flow through an annulus (r* = ) Fig.

Effect of buoyancy on heat transfer in a vertical annulus (r* = ) with upflow of water (inner wall heated uniformly) Fig. Distortion of axial velocity profile due to buoyancy in upward flow through an annulus (r* = ) Fig.

An experimental investigation of inverted annular film boiling heat transfer has been performed for vertical up-flow in a round tube. The working fluid was Ra and the flow conditions covered a pressure range of to kPa (water equivalent range: to kPa) and a mass flux range of to kgm-2s-1 (water equivalent range: to kgm-2s-1).

The inlet qualities of the. In this article, mixed convection heat transfer is numerically studied in a vertical eccentric annulus. For this purpose, full Navier-Stokes equations along with energy equations are solved in a 3-D orthogonal grid using a bipolar cylindrical coordinate system and finite-volume method based on.

A theoretical analysis of an unsteady magnetohydrodynamic free-convective flow of a viscous incompressible and electrically conducting fluid between two concentric vertical cylinders is carried out considering thermal boundary condition of the second kind at the outer surface of the inner cylinder.

This investigation reports the magnetic field effect on natural convection heat transfer in a curved-shape enclosure. The numerical investigation is carried out using the control volume-based-finite element method (CVFEM). The numerical investigations are performed for various values of Hartmann number and Rayleigh number.

The obtained results are depicted in terms of streamlines and. Full text of "Pressure drop and heat transfer in a vertical internally heated other formats LIBRARY U.S. NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA PRESSURE DROP AND HEAT TRANSFER IN A VERTICAL INTERNALLY HEATED ANNULUS * * * * * Liu, Kuang-Ming PRESSURE DROP AND HEAT TRANSFER IN A VERTICAL INTERNALLY HEATED ANNULUS by.

Mixed Convection Opposing Flow in a Vertical Porous Annulus-Two Temperature Model Abdullah A AA Al-Rashed3, Salman Ahmed N J1, H M T Khaleed2, T M Yunus Khan2,4*, K S NazimAhamed1. 1Center for Energy Sciences, Dept. of Mechanical Engineering, University of Malaya, Kuala Lumpur, Malaysia 2Dept of Mechanical Engineering, Faculty of Engineering, Islamic University.Experimental and Numerical Investigation of Natural Convection Heat Transfer in Horizontal Elliptic Annuli major axis is vertical) and with the Rayleigh number as well.

Also, the average The process of natural convection heat transfer in annular space was the subject of.A numerical investigation of natural convection heat transfer withina horizontal annulus with a heating element on the inner cylinder S.-M.

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