Influence of water temperature on spray cooling at high surface temperatures

Kotrbáček, Petr; Chabičovský, Martin; Komínek, Jan; Resl, Ondřej; Bellerová, Hana

doi:10.1016/j.applthermaleng.2022.119074

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…In spray cooling, critical heat flux (CHF) is enhanced by reducing viscosity and surface tension and adding surfactant Tween 20 literature [45]. The heat transfer coefficient in spray cooling depends on the coolant temperature [86].…”

Section: Coolant Modificationmentioning

confidence: 99%

A Review of Parameters and Mechanisms in Spray Cooling

Thakur,

Kadapure,

Hegde

et al. 2023

Metall Mater Eng

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Miniaturisation in avionics, electronics, and medical appliances has led to demands for rapid heat dissipation techniques. The spray cooling technique has gained importance recently due to its advantage over other cooling methods. Parameters affecting heat transfer mechanisms during spray cooling are contemplated. This review presents different heat transfer parameters and their effect on spray cooling by analysis from past studies. Heat transfer surface modifications and different coolant variations to enhance heat transfer effectiveness are also reviewed. Apart from high heat flux having more applications, low heat flux studies have also grabbed the researchers to find solutions with a temperature range lower than 250˚C. Therefore, the upcoming spray cooling technology will have broad applications that will contribute to the maximum efficiency of the heat removal rate.

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Section: Coolant Modificationmentioning

confidence: 99%

A Review of Parameters and Mechanisms in Spray Cooling

Thakur,

Kadapure,

Hegde

et al. 2023

Metall Mater Eng

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“…The process of heat and mass transfer, by using a water droplet as a reference system, is a widely used in various practical applications. Traditionally, such operations are used in fire protection systems [1], agricultural irrigation systems [2], gas cooling processes [3,4], air conditioning and microclimate systems of buildings [5,6], surface treatment and protection of technological processes [7][8][9]. In modern technologies water dispersion processes also takes place in various parts of technological process, such as sessile of droplets and their evaporation from solid surfaces for cooling [10,11], controlling parameters of superheated steam [12], cleaning flue gases [13,14], recovering waste heat from exhaust gas [15], reduction of pollutants in fuel combustion [16], controlling parameters of high-temperature combustion products [17], increasing the effectiveness of turbo-compressors operation [18].…”

Section: Introductionmentioning

confidence: 99%

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

BIKNIENĖ,

PAUKŠTAITIS

2024

mech

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This study is intended for experimental investigation of the influence of boundary conditions on the intensity of phase transformations and heat transfer processes in a suspended water droplet. The results of the dynamics of the averaged heat fluxes densities during the droplet phase change cycle are presented and analysed. The influence of the droplet initial temperature, the surrounding air flow temperature and the additional humidity in the air flow were defined in separate regimes of the droplet phase transformations cycle. The experiments performed demonstrated that the parameters of the air flow surrounding the suspended water droplet affect the intensity of heat fluxes in the droplet throughout whole its phase change cycle. It was experimentally claimed that the initial temperature of the water droplet has no influence on the droplet heat and mass transfer processes in the equilibrium evaporation regime. The obtained results showed that most intensity heat flux densities are at the beginning of the droplet phase change cycle when condensation process occurs on the droplet’s surface in case with biggest amount of additional humidity in the surrounding air flow. This is very important in technologies of cleaning and heat recovery from flue gases.

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“…The water temperature influences the heat transfer coefficient and has a significant effect on the Leidenfrost temperature [13,14]. The paper [15] shows that an increase in cooling water temperature of about 30 degrees Celsius (typical in the industry due to seasonal effects) causes a 10% decrease in the heat transfer coefficient in the film boiling regime and a 17% decrease in the Leidenfrost temperature.…”

Section: Introductionmentioning

confidence: 99%

The Efficient Way to Design Cooling Sections for Heat Treatment of Long Steel Products

et al. 2023

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To achieve the required mechanical properties in the heat treatment of steel, it is necessary to have an adequate cooling rate and to achieve the desired final temperature of the product. This should be achieved with one cooling unit for different product sizes. In order to provide the high variability of the cooling system, different types of nozzles are used in modern cooling systems. Designers often use simplified, inaccurate correlations to predict the heat transfer coefficient, resulting in the oversizing of the designed cooling system or failure to provide the required cooling regime. This typically results in longer commissioning times and higher manufacturing costs of the new cooling system. Accurate information about the required cooling regime and the heat transfer coefficient of the designed cooling is critical. This paper presents a design approach based on laboratory measurements. Firstly, the way to find or validate the required cooling regime is presented. The paper then focuses on nozzle selection and presents laboratory measurements that provide accurate heat transfer coefficients as a function of position and surface temperature for different cooling configurations. Numerical simulations using the measured heat transfer coefficients allow the optimum design to be found for different product sizes.

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Influence of water temperature on spray cooling at high surface temperatures

Cited by 10 publications

References 21 publications

A Review of Parameters and Mechanisms in Spray Cooling

A Review of Parameters and Mechanisms in Spray Cooling

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

The Efficient Way to Design Cooling Sections for Heat Treatment of Long Steel Products

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