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Junsoo Yoo - One of the best experts on this subject based on the ideXlab platform.
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time resolved measurements of liquid vapor thermal interactions throughout the Full Life Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E Estradaperez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
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Time-resolved measurements of liquid–vapor thermal interactions throughout the Full Life-Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E. Estrada-perez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
Yassin A. Hassan - One of the best experts on this subject based on the ideXlab platform.
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time resolved measurements of liquid vapor thermal interactions throughout the Full Life Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E Estradaperez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
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Time-resolved measurements of liquid–vapor thermal interactions throughout the Full Life-Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E. Estrada-perez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
Bandar Alkhudhiri - One of the best experts on this subject based on the ideXlab platform.
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time resolved measurements of liquid vapor thermal interactions throughout the Full Life Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E Estradaperez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
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Time-resolved measurements of liquid–vapor thermal interactions throughout the Full Life-Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E. Estrada-perez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
Mónica J.b. Amorim - One of the best experts on this subject based on the ideXlab platform.
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Graphene-Based Nanomaterials in Soil: Ecotoxicity Assessment Using Enchytraeus crypticus Reduced Full Life Cycle
Nanomaterials (Basel Switzerland), 2019Co-Authors: Monique C. P. Mendonça, Natália P. Rodrigues, Marcelo Bispo De Jesus, Mónica J.b. AmorimAbstract:Graphene-based nanomaterials (GBNs) possess unique physicochemical properties, allowing a wide range of applications in physical, chemical, and biomedical fields. Although GBNs are broadly used, information about their adverse effects on ecosystem health, especially in the terrestrial environment, is limited. Therefore, this study aims to assess the toxicity of two commonly used derivatives of GBNs, graphene oxide (GO) and reduced graphene oxide (rGO), in the soil invertebrate Enchytraeus crypticus using a reduced Full Life Cycle test. At higher exposure concentrations, GO induced high mortality and severe impairment in the reproduction rate, while rGO showed little adverse effect up to 1000 mg/kg. Collectively, our body of results suggests that the degree of oxidation of GO correlates with their toxic effects on E. crypticus, which argues against generalization on GBNs ecotoxicity. Identifying the key factors affecting the toxicity of GBNs, including ecotoxicity, is urgent for the design of safe GBNs for commercial purposes.
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HAZARD ASSESSMENT OF NICKEL NANOPARTICLES IN SOIL - THE USE OF A Full Life Cycle TEST WITH ENCHYTRAEUS CRYPTICUS
Environmental toxicology and chemistry, 2017Co-Authors: Fatima C F Santos, Susana I. L. Gomes, Janeck J. Scott-fordsmand, Mónica J.b. AmorimAbstract:Nanoparticles (NPs) such as nickel (Ni) are widely used in several applications. Nevertheless, the environmental effects of Ni NPs are still poorly understood. In the present study, the toxicity of Ni NPs and nickel nitrate (NiNO3 ) was assessed using the standard test species in soil ecotoxicology, Enchytraeus crypticus (Oligochaeta), in a Full Life Cycle test, adding the endpoints hatching, growth, and time to reach maturity, besides survival and reproduction as in the standard Organisation for Economic Co-operation and Development Guideline 220 and/or International Organization for Standardization 16387. For Ni NPs, the Ni in soil and in soil solution was concentration- and time-dependent, with a relatively higher soil solution content in the lower and shorter exposure concentrations and times. Overall, NiNO3 was more toxic than Ni NPs, and toxicity seemed to occur via different mechanisms. The former caused reduced hatching (50% effect concentration [EC50] = 39 mg Ni/kg soil), and the negative effects remained throughout the Life Cycle, in all measured endpoints (growth, maturation, survival, and reproduction). For Ni NPs, hatching was the most sensitive endpoint (EC50 = 870 mg Ni/kg soil), although the organisms recovered; that is, additional endpoints across the Life Cycle showed that this effect corresponded to a delay in hatching because organisms survived and reproduced at concentrations up to 1800 mg Ni/kg soil. On the other hand, the lowest tested concentration of Ni NPs (100 mg Ni/kg soil) caused reproduction effects similar to those at higher concentrations (1000 and 1800 mg Ni/kg soil). The present results show that the potential implications of a nonmonotonic dose response should be considered when assessing the risks of Ni NP exposure in soil. Environ Toxicol Chem 2017;36:2934-2941. © 2017 SETAC.
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effects of copper oxide nanomaterials cuonms are Life stage dependent Full Life Cycle in enchytraeus crypticus
Environmental Pollution, 2017Co-Authors: Rita C Bicho, Fatima C F Santos, Janeck J Scottfordsmand, Mónica J.b. AmorimAbstract:Abstract Copper oxide nanomaterials (CuONMs) have various applications in industry and enter the terrestrial environment, e.g. via sewage sludge. The effects of CuONMs and copper chloride (CuCl 2 ) were studied comparing the standard enchytraeid reproduction test (ERT) and the Full Life Cycle test (FLCt) with Enchytraeus crypticus . CuONMs mainly affected growth or juveniles’ development, whereas CuCl 2 mainly affected embryo development and/or hatching success and adults survival. Compared to the ERT, the FLCt allowed discrimination of effects between Life stages and provided indication of the underlying mechanisms; further, the FLCt showed increased sensitivity, e.g. reproductive effects for CuONMs: EC 10 = 8 mg Cu/kg and EC 10 = 421 mg Cu/kg for the FLCt and the ERT respectively. The performance of the FLCt is preferred to the ERT and we recommend it as a good alternative to assess hazard of NMs. Effects of CuONMs and CuCl 2 are Life stage dependent and are different between Cu forms.
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effects of ag nanomaterials nm300k and ag salt agno3 can be discriminated in a Full Life Cycle long term test with enchytraeus crypticus
Journal of Hazardous Materials, 2016Co-Authors: Rita C Bicho, Natália P. Rodrigues, Janeck J Scottfordsmand, Tânia Ribeiro, Mónica J.b. AmorimAbstract:Abstract Information on effects of silver nanoparticles on soil invertebrates, especially using long-term exposures, is scarce. In this study we investigated the effects of the reference Ag (NM300K) (compared to AgNO 3 ) using the Full Life Cycle test (FLCt) of the soil invertebrate Enchytraeus crypticus . Results showed that effects were higher compared to the standard reproduction test, which is shorter and does not cover the FLC. Both Ag forms caused a reduction on hatching success, juvenile and adult survival and reproduction with similar ECx. Differences between AgNO 3 and Ag NM300K could be discriminated using the FLCt: AgNO 3 decreased hatching success was shown to be a delay in the process, whereas Ag NM300K caused irreversible effects during the same time frame. These effects may have occurred during the embryo development, hatching (inhibition) or survival of hatched juveniles. Ag NM300K caused non-monotonic concentration-response effect as observed by the high effect of the lowest concentration (20 mg kg-1). It is known that dispersion is higher at lower concentrations – this could explain the increased effect at low concentration. Non monotonic responses are well described in the literature, where effects of high cannot predict for low concentrations, hence special attention should be given for NMs low concentration effects.
Carlos E Estradaperez - One of the best experts on this subject based on the ideXlab platform.
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time resolved measurements of liquid vapor thermal interactions throughout the Full Life Cycle of sliding bubbles at subcooled flow boiling conditions
International Journal of Multiphase Flow, 2018Co-Authors: Carlos E Estradaperez, Yassin A. Hassan, Bandar Alkhudhiri, Junsoo YooAbstract:Abstract The local thermal response of the liquid phase to the presence of sliding bubbles was measured with an infrared camera in subcooled flow-boiling conditions. These measurements were complemented with two high-speed cameras to capture the corresponding bubbles’ dynamics. The liquid–vapor interactions were captured in detail over the Full Life-Cycle of sliding bubbles. Four distinctive phases for the bubble Life-Cycle were identified: A) Spherical bubble growth with strong attachment, B) Deformed bubble growth with weak attachment, C) Detachment with hot liquid quenching, and D) Cold liquid quenching. To the best of the authors’ knowledge, it is the first time that the “detachment with hot liquid quenching phase has been observed. This phase is characterized by a “hot” thermal footprint during the bubble detachment process. It is believed that this footprint is constituted partially from hot liquid released during the condensation of the recently detached bubble, and from released hot fluid previously collected by the bubble during sliding. In addition, this work reveals that using traditional high-speed visualization techniques (side-view camera only) can lead to an underestimation of approximately 40% of the actual bubble–wall contact diameter (dc) which was inferred from the infrared camera measurements.
