- Heat Transfer - Section 1
- Heat Transfer - Section 2
- Heat Transfer - Section 3
- Heat Transfer - Section 4
- Heat Transfer - Section 5
- Heat Transfer - Section 6
- Heat Transfer - Section 7
- Heat Transfer - Section 8
- Heat Transfer - Section 9
- Heat Transfer - Section 10
- Heat Transfer - Section 11


Heat Transfer - Engineering
Q1: Which of the following is the most controlling factor for the rate of bubble detachment from the hot solid surface ?A Liquid density
B Liquid viscosity
C Hot surface temperature
D Interfacial tension
ANS:D - Interfacial tension The most controlling factor for the rate of bubble detachment from a hot solid surface is the interfacial tension. Interfacial tension refers to the force acting along the interface between two immiscible phases, such as a liquid and a gas (e.g., bubbles). When bubbles form on a hot solid surface, the interfacial tension plays a crucial role in determining how strongly the liquid adheres to the surface and whether the bubble can detach. A lower interfacial tension allows bubbles to detach more easily from the surface, while a higher interfacial tension tends to keep bubbles adhered to the surface. Liquid density, liquid viscosity, and hot surface temperature can also influence bubble detachment, but to a lesser extent compared to interfacial tension. For example:
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