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Nahme-Griffith number, Nakashima, CY
Flow and Pressure Drop in Annular Ducts with One Rotating Surface Heat Transfer in Annular Ducts with One Rotating Surface
Nanoparticles, for heat transfer augmentation, Naphthalene: Napthenes: National practice, in mechanical design, guide to, Natural convection: Natural draft cooling towers: Natural frequency of tube vibration in heat exchangers, Navier-Stokes equation, Neon: Neopentane: Net free area, in double-pipe heat exchangers, Netherlands, guide to national mechanical design practice, Networks, of heat exchangers, pinch analysis method for design of, Neumann boundary conditions, finite difference method, Nickel, thermal and mechanical properties Nickel alloys, Nickel steels, Niessen, R, Nitric oxide: Nitriles: Nitrobenzene: Nitro derivatives: Nitroethane: Nitrogen: Nitrogen dioxide: Nitrogen peroxide: Nitromethane: m-Nitrotoluene: Nitrous oxide Noise: Nonadecane: Nonadecene: Nonane: Nonene: Nonanol: Nonaqueous fluids, critical heat flux in, Non-circular microchannels: Noncondensables: Nondestructive testing, of heat exchangers Nongray media, interaction phenomena with, Nonmetallic materials: Non-Newtonian flow: Nonparticipating media, radiation interaction in, Nonuniform heat flux, critical heat flux with, Non-wetting surfaces, in condensation augmentation, North, C, No-tubes-in-window shells, calculation of heat transfer and pressure drop in, Nozzles: Nowell, D G, Nucleate boiling: Nuclear industry, fouling problems in, Nucleation: Nucleation sites: Nuclei, formation in supersaturated vapor, Number of transfer units (NTU): Numerical methods: Nusselt: Nusselt-Graetz problem, in laminar heat transfer in ducts, Nusselt number:
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Heat Transfer in Annular Ducts with One Rotating Surface

DOI 10.1615/hedhme.a.000183

2.5.16 Heat transfer in annular ducts with one rotating surface

C. Y. Nakashima, S. Oliveira Jr., E. F. Caetano

A. Introduction

Section 151A gives a brief introduction to single phase fluid flow inside annular ducts with rotation of inner surface. In that section, the basic flow patterns that cause the pressure drop to rise are described. The same flow patterns are responsible for a heat transfer enhancement. The behavior of the heat transfer in annular ducts with rotation of inner surface should, therefore, be analyzed bearing in mind the fluid flow behavior.

B. Heat transfer coefficient

Several authors studied the heat transfer between inner and/or outer cylinders and the fluid flowing inside rotating annular channels. Even though the heat transfer is a complex function of several parameters (fluid characteristics, operational conditions, heating or cooling among others), it is possible to summarize the data in a general pattern in terms of Nusselt number, Taylor number and Reynolds number. This is exemplified by the experimental data of Becker and Kaye (1962) for the case of heat transfer from the outer cylinder as shown in Figure 1.

Figure 1 Nusselt number behavior in annular channels with rotation of the inner cylinder: a) transition laminar/laminar with vortices and b) transition turbulent/turbulent with vortices [after Becker and Kaye (1962)]

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