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Heat Transfer during Spray Cooling of Flat Surfaces with Water at Large Reynolds Numbers

Result description

We present a new Nusselt number correlation for spray cooling at large Reynolds numbers and high surface temperatures for water sprays impinging perpendicularly onto a flat plate. A large set of experimental data on spray cooling of hot surfaces with water has been analyzed, including the water temperature effects. For large-scale cooling, such as in industrial processes, large number of injection parameters such as number, type, pressure, and angle of the spray injection has led to a multitude of correlations that are difficult for general and practical applications. However, by synthesizing a set of experimental data where all of the above parameters have been varied, we find that the Nusselt number and therefore the heat transfer coefficient can be cast accurately as a function of the Reynolds number. Water is widely used as the coolant during spray cooling, and has a specific phase change characteristic. At large Reynolds number (Re > 100,000) and surface temperature (Ts > 600°C) ranges, which are of interest in large-scale spray cooling, the effect of water temperature is quite significant as it affects the film boiling close to the surface. This effect also has been parameterized using experimental data.

Keywords

Impinging FlowSpray CoolingHeat TransferMeasurements

The result's identifiers

Alternative languages

  • Result language

    angličtina

  • Original language name

    Heat Transfer during Spray Cooling of Flat Surfaces with Water at Large Reynolds Numbers

  • Original language description

    We present a new Nusselt number correlation for spray cooling at large Reynolds numbers and high surface temperatures for water sprays impinging perpendicularly onto a flat plate. A large set of experimental data on spray cooling of hot surfaces with water has been analyzed, including the water temperature effects. For large-scale cooling, such as in industrial processes, large number of injection parameters such as number, type, pressure, and angle of the spray injection has led to a multitude of correlations that are difficult for general and practical applications. However, by synthesizing a set of experimental data where all of the above parameters have been varied, we find that the Nusselt number and therefore the heat transfer coefficient can be cast accurately as a function of the Reynolds number. Water is widely used as the coolant during spray cooling, and has a specific phase change characteristic. At large Reynolds number (Re > 100,000) and surface temperature (Ts > 600°C) ranges, which are of interest in large-scale spray cooling, the effect of water temperature is quite significant as it affects the film boiling close to the surface. This effect also has been parameterized using experimental data.

  • Czech name

  • Czech description

Classification

  • Type

    Jost - Miscellaneous article in a specialist periodical

  • CEP classification

  • OECD FORD branch

    20303 - Thermodynamics

Result continuities

Others

  • Publication year

    2016

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Journal of Flow Control, Measurement & Visualization

  • ISSN

    2329-3330

  • e-ISSN

  • Volume of the periodical

    4

  • Issue of the periodical within the volume

    3

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    10

  • Pages from-to

    104-113

  • UT code for WoS article

  • EID of the result in the Scopus database

Basic information

Result type

Jost - Miscellaneous article in a specialist periodical

Jost

OECD FORD

Thermodynamics

Year of implementation

2016