Influence of anomalous temperature dependence of water density on convection at lateral heating
V.I. Bukreev and A.V. Gusev
Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
bukreev@hydro.nsc.ru
Keywords: anomalous dependence of water density on temperature, lateral heating, convective instability
Pages: 613-622
Abstract
The article provides results of experimental investigation of a fresh water motion in a flume with limited dimensions at lateral heating. The initial water temperature in the flume ranged from 0 to 22 ºС. It is shown that there are qualitative changes of the motion picture in the vicinity of initial temperature in the flume equal to the one at which water has maximal density (approximately 4 ºС). At an initial temperature in the flume exceeding or equal to 4 ºС, the heated water propagates in the form of a relatively thin surface jet, and at jet reflection from the flume end walls the heated water is accumulated only in the upper layer. When the initial temperature in the flume is below 4 ºС the convective instability develops. A part of the heated water sinks to the bottom. The paper provides respective illustrations and quantitative data on the distribution of temperature and velocity.
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