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Molten steel is kept in a ladle. Due in natural convection. mixing occurs inside the melt. A 1cm diameter sphere is held in the centre of the melt where the steel flows upward. so as to measure the force exerted by the melt on the sphere. The force. F exerted by the melt on the sphere is given by $$F = f\left( {\frac{\pi }{8}} \right).\left( {\frac{{{\mu ^2}}}{8}} \right){\left( {\operatorname{Re} } \right)^2}.$$
Data: Density of liquid steels
= 7100 kg. m-3
Viscosity of liquid steel
= 6.5 × 10-3 kg. m-1. s-1
Reynolds number (Re) of the melt
= 5 × 103
Friction factor (f) = 0.3
The velocity of melt (m.s-1) in the central portion of the ladle would be
Melt spinning of polymers involves the forcing of polymer melt through spinnerettes (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter polymer melt to harden into filaments. Melt spinning is not used in case of the __________ fibres.
Statement A: Response of plants to low temperature is regulated by a hypothetical hormone. Statement B: Response of plants to different periods of light is also regulated by a hypothetical hormone.
Consider the statements A, B, C on metamorphic rocks and choose the correct answer: A. When igneous and sedimentary rocks are subjected to heat and pressure they change to metamorphic rocks. B. Metamorphic rocks melt to form molten magma when subjected to great heat and pressure. C. Marble is a metamorphic rock.
Geysers occur where magma lies just below the earth's surface, particularly in volcanic regions _____ Iceland or New Zealand.
SS.Geysers occur where magma lies just below the earth's surface, particularly in volcanic regions....... Iceland or New Zeeland.
Magma that reaches earth's surface and then solidifies is called
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
The rock formed from the solidification of molten matter (magma) is called:
The rocks which are formed due to cooling of magma at a considerable depth from earth's surface are called