Heat transfer of supercritical mixtures of water, ethanol and nitrogen in a bluff body annular flow

Stathopoulos, Panagiotis; Ninck, Kaspar; Rohr, Philipp Rudolf von

doi:10.1016/j.supflu.2012.06.006

Cited by 19 publications

(9 citation statements)

References 13 publications

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“…Sci. 2020, 10, x FOR PEER REVIEW 30 of 42 extremely strong (Figure 9a) [26]. As a supplement, Stathopoulos further verifies the heat transfer enhancement [55].…”

Section: Heat Transfermentioning

confidence: 55%

“…In most circumstances, the convective heat transfer of the fluid will be enhanced near the critical point and the convective heat transfer coefficient reaches the highest point. Stathopoulos et al found that when the heat flux was low, the convective heat transfer coefficient increased obviously near the pseudo-critical point of the mixture, and the convective heat transfer was extremely strong (Figure 9a) [26]. As a supplement, Stathopoulos further verifies the heat transfer enhancement [55].…”

Section: Heat Transfermentioning

confidence: 79%

“…Heat transfer deterioration is probably due to the interactions among these factors including low mass flow rate, high heat flux, and special relations in different temperatures (fluid temperature < pseudo-critical point < wall temperature). In Stathopoulos's experiments [26], when the heat flux increased to 0.7 MW/m 2 , there was almost no improvement of convective heat transfer near the pseudo-critical point, compared to other temperatures (Figure 9b). We believe that the reason for this phenomenon is the same as that causing heat transfer deterioration, but to a different extent.…”

Section: Heat Transfermentioning

confidence: 89%

“…Subsequently, Stathopoulos et al tested the hot surface forced ignition of the ethanol-oxygen hydrothermal flame on the pilot platform, to evaluate the self-developed ignition device and understand the effects of the changes of transcritical fluid properties on the ignition mechanism [55]. The study on the convective heat transfer coefficient was a further advance of the research results in reference [26]. It pointed out that ignition temperature was passively related to the fluid temperature, and specific fluid temperature corresponded to specific minimum ignition temperature (see Section 5 for more details).…”

Section: Hydrothermal Spallation Drillingmentioning

confidence: 99%

“…As the main experimental apparatus to study the generation and the characteristics of hydrothermal flame, hydrothermal flame reactor (HFR) is designed to confine the flame in a certain space. For example, to explore the hydrothermal spallation drilling of methanol [24,25] and ethanol [26], the ETH water-cooled hydrothermal burner (WCHB) has been upgraded to the fourth generation [23,27], and equipped with advanced measuring [22] and ignition devices [23]. Taking methanol [28,29] and isopropanol [17,[30][31][32][33][34][35][36][37] as the auxiliary fuels, the University of Valladolid has optimized their TWRs [33,37] to study the characteristics and effects of hydrothermal flame enhanced SCWO treatment for recalcitrant pollutants.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Review on an Advanced Combustion Technology: Supercritical Hydrothermal Combustion

Cui

Wang

et al. 2020

Applied Sciences

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Supercritical hydrothermal combustion, a new and promising homogeneous combustion technology with a wide range of application scenarios and broad development prospects, provides creative ideas and means for the enhanced degradation of organic wastes, hydrothermal spallation drilling, thermal recovery of heavy oil, etc. This technology is elaborated upon in five parts: (1) introducing the main devices including semi-batch reactor and continuous reactor to study the hydrothermal flame in accordance with research institutions, (2) presenting the research status of related numerical simulation from the angles of reaction kinetics and flow-reaction, (3) summarizing the characteristics of hydrothermal flame and combustion by five key parameters, (4) dividing up ignition process and explaining ignition mechanism from the perspectives of critical physical properties of water and heat transfer and mixing conditions, (5) discussing and forecasting its industrial applications including hydrothermal spallation drilling, the thermal recovery of heavy oil, the clean conversion and utilization of coal-based fuel, and the harmless treatment of pollutants. By and large, this paper analyzed in detail everything from experimental equipment to industrial applications, from combustion characteristics to ignition mechanisms, and from summary conclusions to prospect prediction. In the end, herein is summarized a couple of existing paramount scientific and technical obstacles in hydrothermal combustion. Further significant studies in the future should include excellent reactors, advanced monitoring techniques, and powerful computational fluid dynamics.

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“…Sci. 2020, 10, x FOR PEER REVIEW 30 of 42 extremely strong (Figure 9a) [26]. As a supplement, Stathopoulos further verifies the heat transfer enhancement [55].…”

Section: Heat Transfermentioning

confidence: 55%

Section: Heat Transfermentioning

confidence: 79%

Section: Heat Transfermentioning

confidence: 89%

Section: Hydrothermal Spallation Drillingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Review on an Advanced Combustion Technology: Supercritical Hydrothermal Combustion

Cui

Wang

et al. 2020

Applied Sciences

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Theoretical investigations on heat transfer to H2O/CO2 mixtures in supercritical region

Chen

Liu

Zhang

et al. 2020

Sci. China Technol. Sci.

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Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

Song

Al‐Duri

et al. 2018

Applied Thermal Engineering

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In view of violent changes of thermo-physical properties, the segmental design method is adopted to explore the heat exchange performances of the transcritical nitrogen (T-N 2) evaporator used for liquid air energy storage, in which cold N 2 is heated up successively by hot propane and methanol in two wide temperature sections. The local heat capacity rate ratio between cold and hot fluids has crucial effects on the local heat exchange performance of evaporator, such as local effectiveness, local entransy dissipation, and local required heat conductance or local heat transfer rate. They have extremums near the positions where the local heat capacity rate ratio equals one, but their optimal values need to be determined by combining the changing trend of the local heat capacity rate ratio. The total heat exchange performance of evaporator is evaluated using total entransy dissipation and total exergy efficiency. When the heat load is fixed, the total performance is improved with the decrease in the mass flow rate of methanol, but at the expense of the required total heat conductance; The total performance can be optimized by precisely tailoring the heat load ratios between the two temperature sections. When the heat conductance is given, the optimum total performance can be obtained by adjusting the mass flow rate of hot fluids at a fixed heat conductance ratio; Increasing the heat conductance ratio of the low temperature section can further elevate the optimum total performance whereas the affordable heat load or the outlet temperature of N 2 is notably decreased. Increasing N 2 pressure elevates the total performance of evaporator but diminishes the extractable cold amount from the liquid N 2 in the same temperature rise. This work is beneficial for selection of key parameters to achieve optimal operation of the T-N 2 evaporator.

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Heat transfer of supercritical mixtures of water, ethanol and nitrogen in a bluff body annular flow

Cited by 19 publications

References 13 publications

Review on an Advanced Combustion Technology: Supercritical Hydrothermal Combustion

Review on an Advanced Combustion Technology: Supercritical Hydrothermal Combustion

Theoretical investigations on heat transfer to H2O/CO2 mixtures in supercritical region

Theoretical analysis for heat exchange performance of transcritical nitrogen evaporator used for liquid air energy storage

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