Study on the cooling performance of sea salt solution during reflood heat transfer in a long vertical tube

Lee, Seungwon; Kim, Seong Man; Park, Seong Dae; Bang, In Cheol

doi:10.1016/j.ijheatmasstransfer.2012.12.046

Cited by 35 publications

(5 citation statements)

References 16 publications

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“…In recent years, the effect of surfactants has also been studied numerically [18,19]. Since the present work is focusing on electrolytes, specifically NaCl, added to water, a particular application is also the emergency cooling of nuclear power reactors with seawater as was done in the Daiichi accident near Fukushima in 2011 after an earthquake (e.g., [20]). In general, also a link to previous deep-sea studies could be drawn [16,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water

et al. 2018

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Abstract:The bubble shape influences the transfer of momentum and heat/mass between the bubble and the surrounding fluid as well as the flow field around the bubble. The shape is determined by the interaction of the fluid field in the bubble, the physics on the surface, and the surrounding flow field. It is well known that contaminations can disturb the surface physics so that the bubble shape can be influenced. Indeed, an influence of sodium chloride (NaCl) on the hydrodynamics of bubbly flows was shown for air/water systems in previous studies. The aim of the present work is to investigate if, and to what extent, the NaCl concentration affects the bubble shape in bubble columns. For this purpose, several experiments at the Helmholtz-Zentrum Dresden-Rossendorf and at the pilot-scale bubble column at the Politecnico di Milano are evaluated. The experiments were executed independently from each other and were evaluated with different methods. All experiments show that the bubble shape is not distinctly affected in the examined concentration range from 0 to 1 M NaCl, which is in contrast to a previous study on single bubbles. Therefore, the effect of NaCl on the hydrodynamics of bubbly flows is not induced by the bubble shape.

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Section: Introductionmentioning

confidence: 99%

The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water

et al. 2018

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“…Heated metals are frequently immersed in a coolant for many applications, such as the hardening of heated steel and rocket engines [ 1 ]. Quenching is also an important process for the safety of nuclear plants, especially when a severe accident such as the loss of coolant occurs [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Quenching Behavior of a Copper Cube in the Cellulose Nanofiber Solution

2022

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This study investigates the quenching behavior and heat transfer characteristics of a copper cube immersed in cellulose nanofiber (CNF) solutions. The heat transfer performance of CNF solutions during boiling has been examined in several studies, but the quenching behavior of CNF solutions, which is an important heat transfer method, has not been evaluated. In this study, four copper cubes with the same dimensions and four different quenchants (deionized water and 0.01%, 0.1% and 0.5% CNF solutions) were prepared. A copper cube heated to greater than 600 °C was submerged three times in the quenchant. This was repeated with different copper cubes in each of the quenchants. The time at which the heated copper cube convectively transferred heat to the surroundings was recorded. The cooling time was shortest when the cube was immersed in a 0.5% CNF solution for the first time. The average cooling time for quenching in the 0.5% CNF solution was 30.3% shorter than that in DI water. In this study, film boiling during quenching was thoroughly observed and analyzed to explain the cause of enhancement in heat transfer efficiency.

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“…In addition, the surface heat flux in the transition boiling regime is also improved, and this could be due to salt deposition on the hot surface during cooling. Lee et al [8] investigated the effect of 35% sea salt solution on heat transfer from a reflood vertical long tube. A tube was heated up by applying a voltage to generate an electric current that heated up the tube by Joule effect.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dissolved Salts on Steady-State Heat Transfer Using Excessive Cooling by Water-Air Mists

Hernández-Bocanegra

Acosta-González

Ramos-Banderas

et al. 2022

Metals

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This work reports a new finding on the effect of dissolved salts, in water-air mists, on spray heat removal efficiencies from a metallic surface under steady state conditions. The experimental system is based on a calorimeter that measures heat flux removed by water-air mist sprays from 8 mm diameter × 2.5 mm thickness platinum samples heated by electromagnetic induction. During steady-state experiments, a solid-state controller equilibrates automatically the rate of heat generation with the rate of heat removal to reach a constant temperature. Equilibrium temperatures for stepwise T rising include 200 to 1200 °C in steps of 100 °C and then stepwise T that is lowered to 200 °C. The new finding is that, when using soft water-air mist and a high-water impingement density, a lack of temperature control during stepwise T increases was observed when stepping from 200 to 300 °C. This lack of temperature control is associated with a high heat flux and is attributed to the stabilization of the single-phase convection regime when T rising from 200 to 300 °C. Temperature stabilization was again possible only at wall temperatures Tw≥600 °C, at which single-phase convection was not stable. In contrast, when using a hard water-air mist under the same fluid flow conditions, all temperatures were readily reached. This is attributed to the transition from single-phase convection to nucleate boiling regime when T increased from 200 to 300 °C. This transition leads to a decrease in heat flux due to a reduction in the contact area between liquid and the wall surface. Finally, the corresponding boiling curves at high wall temperatures show the importance of heat radiation from the wall to understand the effect of salts during the stable vapor film regime.

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Study on the cooling performance of sea salt solution during reflood heat transfer in a long vertical tube

Cited by 35 publications

References 16 publications

The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water

The Bubble Shape in Contaminated Bubbly Flows: Results for Different NaCl Concentrations in Purified Water

Experimental Study on the Quenching Behavior of a Copper Cube in the Cellulose Nanofiber Solution

Effect of Dissolved Salts on Steady-State Heat Transfer Using Excessive Cooling by Water-Air Mists

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