Abstract
The process of heat transfer due to natural convection in narrow vertical water-filled pipes is considered. Experimental and simulation data are given. The mechanism of natural convection development is analysed.
Highlights
It is well known that natural convection in enclosed spaces, for example, in narrow vertical tubes of various heat engineering equipment, influences its operating features
Ra = βgρ2CpL3ΔT /, Nuav = qavL / (ΔT·λ) where β is the volume expansion coefficient, g is the gravitational acceleration, ρ is the fluid density, Cp is the specific heat at constant pressure, L is the characteristic length-scale of the system, ΔT is the temperature difference between hot and cold ‘walls’, qav is the heat flux from the wall to the fluid, averaged over the wall, λ is the thermal conductivity, μ is the dynamic viscosity of liquid
The simulation of natural convection in narrow vertical pipes showed that the convection intensity depends on the inner diameter of the channel and the heat flux supplied
Summary
It is well known that natural convection in enclosed spaces, for example, in narrow vertical tubes of various heat engineering equipment, influences its operating features. Where β is the volume expansion coefficient, g is the gravitational acceleration, ρ is the fluid density, Cp is the specific heat at constant pressure, L is the characteristic length-scale of the system, ΔT is the temperature difference between hot and cold ‘walls’, qav is the heat flux from the wall to the fluid, averaged over the wall, λ is the thermal conductivity, μ is the dynamic viscosity of liquid The application of this approach in the analysis of natural convection in narrow vertical channels is limited by the following reasons: The characteristic dimension, which is usually determined in channels as a layer thickness between the hot and cold walls, in this case depends on the channel size. That’s why a computer simulation using the commercial software Solidworks Flow Simulation was carried out to study the case
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