ANS:A - Dirhing's

Heisler's chart is known as the transient heat conduction chart. Explanation:

1. Transient Heat Conduction: Transient heat conduction refers to the process where temperature changes with respect to time in a solid medium. This occurs when there is a sudden change in boundary conditions, such as a sudden change in temperature at the surface of the material.
2. Heisler's Chart: Heisler's chart is a graphical method used to solve transient heat conduction problems in solids with certain boundary conditions. It provides a convenient way to determine temperature distributions within a material over time, given specific initial and boundary conditions.
3. Features of Heisler's Chart:
   • It is typically used for problems involving semi-infinite or infinite solid bodies.
   • It accounts for both internal and external conduction resistances.
   • The chart provides dimensionless temperature distributions for different geometries and boundary conditions, allowing engineers to quickly find solutions to transient heat conduction problems without needing to solve complex differential equations.
4. Usage: Engineers and researchers use Heisler's chart to analyze heat conduction problems in various engineering applications, such as the cooling of components, heat treatment processes, and thermal management of electronic devices.
5. Other Charts: While there are other charts and methods available for solving transient heat conduction problems, such as numerical methods or analytical solutions, Heisler's chart remains a popular and widely used tool due to its simplicity and convenience for certain types of problems.