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Density Currents

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Density Currents 

currents in the seas and oceans caused by the horizontal pressure gradients resulting from the nonuniform distribution of density in seawater. Permanent density currents, along with wind currents, play an important part in the overall circulation system of the surface waters of the world ocean. In the deep layers, where wind-driven currents are attenuated, density currents predominate. They are characteristic in straits between bodies of water with different densities. Owing to the Coriolis force, density currents move perpendicular to the horizontal density gradients.

The theory of density currents is based on the circulation theory of the Norwegian geophysicist V. F. K. Bjerknes. The theory was elaborated by the Norwegian B. Helland-Hansen, the Swede J. W. Sandström, and the Soviet scientist N. N. Zubov, who propounded the dynamic method of calculating sea currents from the distribution of water density.



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The researchers have revealed that the new type of LED achieves a notable reduction in "efficiency droop", a well-known phenomenon that provokes LEDs to be most efficient when receiving low-density currents of electricity, but then to lose efficiency as higher density currents of electricity are fed into the device.
Vicinity of the wall make density currents and wall jets similar in some sense but Variation of density, dynamic instability due to shear forces at the interface of dense layer and ambient fluid with buoyancy forces effect cause this flows more complex than wall jets.
In this work, 2-D and 3-D steady-state salt solution density currents are investigated by means of a set of experimental studies and the data used to verify the numerical model.
 
 
 
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