Rohsenowtype

Rohsenowtype is a term used in the field of heat transfer to describe a specific type of boiling heat transfer regime. It is characterized by nucleate boiling that transitions into film boiling. This transition occurs as the heat flux increases, leading to a significant increase in the temperature difference between the heating surface and the fluid.

In nucleate boiling, bubbles form and detach from nucleation sites on the heating surface. As the heat flux rises, the number of nucleation sites and the rate of bubble generation increase. This leads to a higher heat transfer coefficient.

However, as the heat flux continues to climb, the bubble generation becomes so intense that the bubbles begin to merge and form a continuous vapor film on the heating surface. This is the onset of film boiling. In this regime, the vapor film acts as an insulating layer, reducing the contact between the heating surface and the liquid. Consequently, the heat transfer coefficient decreases significantly, and the surface temperature rises sharply. This phenomenon is known as the departure from nucleate boiling (DNB) or the critical heat flux (CHF).

The term "Rohsenowtype" is often associated with the empirical correlations developed by Warren M. Rohsenow to predict boiling heat transfer coefficients. These correlations are widely used in engineering applications to estimate heat transfer rates during boiling processes. Understanding the Rohsenowtype regime is crucial for designing efficient heat transfer equipment, such as boilers, evaporators, and condensers, and for preventing overheating and potential equipment failure.