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The Boiling Phenomena and their Proper Identification and Discrimination Methodology.

A R Pati1, B Swain2, S S Mohapatra3

  • 1Department of Chemical Engineering, Spray Boiling Heat Transfer Laboratory, National Institute of Technology Rourkela, Rourkela, 769008, India.

Scientific Reports
|May 21, 2020
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Summary
This summary is machine-generated.

Identifying boiling phenomena requires more than the Nukiyama curve. This study introduces a new condition and protocol to accurately detect boiling behavior and distinguish between different boiling regimes for better process analysis.

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Area of Science:

  • Thermodynamics and Heat Transfer
  • Fluid Mechanics
  • Phase Change Phenomena

Background:

  • The traditional Nukiyama pool-boiling curve (heat flux versus temperature difference) is insufficient for accurately identifying boiling phenomena.
  • Heating and cooling phases can mimic boiling behavior, leading to misidentification of actual boiling processes.
  • A lack of established methods for discriminating between various boiling methodologies exists in open literature.

Purpose of the Study:

  • To develop a reliable condition for identifying the existence of boiling behavior during heating or quenching.
  • To establish a protocol for accurately discriminating between different boiling regimes.
  • To address the limitations of existing methods for boiling phenomena analysis.

Main Methods:

  • Development of a new condition, represented as (1/St), to describe the existence of boiling.
  • Validation of the developed condition using diverse boiling processes.
  • Establishment of a protocol based on the slope of the heat transfer coefficient versus temperature difference (h versus ΔT) curve, rather than the traditional boiling curve.

Main Results:

  • The developed condition (1/St) has been successfully validated across various boiling processes.
  • The proposed protocol, utilizing the slope of the h versus ΔT curve, effectively identifies proper boiling regimes.
  • The new methodology provides a more accurate discrimination of boiling behavior compared to the Nukiyama curve.

Conclusions:

  • The traditional Nukiyama curve is not a definitive indicator of boiling phenomena.
  • The newly developed condition and protocol offer a robust method for identifying and discriminating boiling regimes.
  • This research provides a valuable tool for accurate analysis of phase change processes in various applications.