What Is the Pool Boiling Heat Flux & Critical Heat Flux (CHF) Calculator?
Pool boiling heat flux characterizes heat transfer across a submerged heater into a quiescent pool of saturated liquid.
How Does the Pool Boiling Heat Flux & Critical Heat Flux (CHF) Calculator Work?
The Zuber correlation calculates maximum hydrodynamic vapor escape limit q"_max. In nucleate boiling, heat flux scales strongly with the cube of wall superheat (ΔTe)³.
Pool Boiling Heat Flux & Critical Heat Flux (CHF) Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Kutateladze-Zuber hydrodynamic instability correlation derives maximum pool boiling Critical Heat Flux (CHF). Operating safely below CHF prevents surface burnout.
How to Use the Pool Boiling Heat Flux & Critical Heat Flux (CHF) Calculator
- Enter wall superheat temperature difference in °C.
- Optionally customize latent heat of vaporization.
- Check whether the operating point resides safely below the CHF threshold.
Step-by-Step Example Calculation
Atmospheric Saturated Water Boiling with 12°C Wall Superheat
Input Values:
Understanding Your Result
Nucleate Heat Flux: Estimated heat transferred in kW/m².
Critical Heat Flux (CHF): Maximum allowable safe heat flux before vapor blanket transition.
CHF Safety Margin: Ratio of CHF to operating heat flux (should be ≥ 1.5 - 2.0).
Factors That Affect the Result
- System pressure alters fluid density and latent heat; surface roughness and wettability enhance bubble nucleation site density.
When Should You Use This Calculator?
- Thermal design of steam boilers, nuclear fuel rod cooling channels, and electronics immersion cooling baths.
Assumptions & Limitations
- Models saturated pool boiling on a horizontal plate without forced convection bulk flow.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Kutateladze-Zuber hydrodynamic instability model.