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Chapter 1: Heat and Temperature-7 (in Hindi)
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In this lesson discuss the Convection and Radiation.

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4. Combination of Metallic Conductors Equivalent thermal conductivity in series combination of conductors 1 +22 Ki K 2Ki K2 1 +K 2 If we have more than two slabs in the compound slab. The total thermal resistance of the slabs connected in series slabs connected +A, Reg. = R1+R2+ Ri + R2 + R3 + Equivalent thermal conductivity in parallel combination of conductors 15 R RIR2

5. Equivalent thermal conductivity in parallel combination of conductors R R1 R2 For more than two slabs, we have R R1 R2 R3 K1A1 + K2 A2 A1 A2 eq Ki + K- 2 lf, Al=A2, then Keg Convection Convection like conduction requires a material medium. It is the process in which heat is transferred from one place to other by actual movement of heated material particles.It is possible only in fluids. The type of convection which results from difference in densities is called natural convection. For example, a fluid in a container heated through its bottom. However, ifa heated fluid is forced to move by a blower, fan or pump, the process is called forced convection. The rate of heat convection from an object is

6. proportional to the temperature difference (A0) between the object and convective fluid and the area of contact A, dQ dt Le., where, h represents a constant of proportionality called convection viscosity, specific heat and thermal conductivity. convection coefficient and depends on the properties of fluid such as density,