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The analogy of conductivity in heat transfer to fluid flow is

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HPCL Engineer Mechanical 12 Aug 2021 Official Paper (Shift 1)
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  1. Density of fluid
  2. Viscosity of fluid
  3. Velocity of fluid
  4. Pressure of fluid

Answer (Detailed Solution Below)

Option 1 : Density of fluid
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A liquid's density is a measure of how heavy it is for the amount measured. When equivalent amounts or volumes of two distinct liquids are weighed, the liquid that weighs more is more dense. The transfer of vibrational forces between molecules is the mechanism of conduction in fluid flow. As the temperature of the liquid rises, the kinetic energy of the molecules rises as well. This resulted in an increase in vibrational forces.Due this density difference heat transfer in fluid flow occurs.

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Q5.The distribution of temperature T, at a particular instant, across a large concrete wall, 1 m thick, which is heated from one side is given by the equation T = 150 − 80x + 16x2, where the distance x is in meters and T is in degree Celsius. Thermal conductivity of wall is 0.6 W/mK, area of cross section is 10 m2. The heat accumulated in unit time at this instant in the concrete wall is
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Q1.If the temperature of a black body doubles, how many times will its emissive power increase?
Q2.A grey body is defined as a body that:
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Q4.Intensity of radiation varies with the:
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Q9.In free convection, Nusselt number is the function of
Q10.A wall of a furnace is made up of inside layer of silica brick 119 mm thick covered with a layer of magnesite brick 240 mm thick. The temperatures at the inside surface of silica brick wall and outside surface of magnesite brick wall are 780 °C and 102 °C respectively. The contact thermal resistance between the two walls at the interface is 0.003 °C/W per unit wall area. Thermal conductivities of silica and magnesite bricks are 1.7 W/m °C and 6 W/m °C. The rate of heat loss per unit area of the wall is
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