Effect of ambient temperature and relative humidity on interfacial temperature during early stages of drop evaporation

Fukatani, Yuki; Orejon, Daniel; Kita, Yutaku; Takata, Yasuyuki; Kim, Jungho; Sefiane, Khellil

doi:10.1103/physreve.93.043103

Cited by 90 publications

(73 citation statements)

References 36 publications

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“…Within the studied datasets, Srinagar shows the strongest negative correlation with temperature indicating the reduction in the COVID cases with the increase of temperature and a positive correlation with relative humidity. It has been well established that with the increase in temperature, the relative humidity should drop given that the holding capacity of air will increase [52]. Similar correlations can be seen for Kasaragod and New York.…”

Section: Seir Model Outputsupporting

confidence: 54%

Exploring Dependence of COVID-19 on Environmental Factors and Spread Prediction in India

Bherwani

Gupta

Anjum

et al. 2020

Preprint

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The pandemic of “Corona Virus Disease 2019” or COVID-19 has taken the world by storm. Majority of nations of the world have been challenged by the novel coronavirus, which is supposedly of zoonotic origin and is known as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The present work attempts to evaluate the spread of COVID-19 in India. The methodology of assessment uses SEIR (Susceptible-Exposed-Infectious-Removed) model to establish the impact of socio-behavioural aspect, especially social distancing, affecting the numbers of COVID-19 cases per day. The lockdown initiated by Government of India (GoI) scenario is weighed against a scenario with a possible initiation of community spread due to crowded gatherings in India. The resultant changes, as against the lockdown scenario, has been reported in terms of the increase in the number of cases and stretch of the timeline to mitigate the COVID-19 spread. Impact of environmental factors like temperature and relative humidity have also been analyzed using statistical methods, including Response Surface Methodology (RSM) and Correlation. It has been found that the spread of cases is dependent on environmental conditions, i.e. temperature and relative humidity. This study is expected to help the policymakers and stakeholders to device an improved action plan to alleviate the COVID-19 spread, especially in India.

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Section: Seir Model Outputsupporting

confidence: 54%

Exploring Dependence of COVID-19 on Environmental Factors and Spread Prediction in India

Bherwani

Gupta

Anjum

et al. 2020

Preprint

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“…Moreover, hydrothermal waves (HTWs) arising due to Marangoni stresses traveling azimuthally from center to the edge of the drop are observed in evaporating alcohol drops [24,25]. Numerous experimental and theoretical studies are recently reported aiming for a further understanding of the physical mechanisms of mentioned HTWs and Marngoni flows within evaporating drops [14,26,27].…”

Section: Introductionmentioning

confidence: 99%

Evaporation kinetics of pure water drops: Thermal patterns, Marangoni flow, and interfacial temperature difference

et al. 2018

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We report a systematic study on the role of Marangoni convection on the evaporation kinetics of pure water drops, considering the influence of heating regime and surface wettability. The Marangoni flows were induced via heating under constant wall temperature (uniform heating) and constant heat flux (local heating) regimes below the drops. To visualize the thermal patterns/flows emerging within the water drops we employed infrared (IR) thermography and we captured the evolution of the drop profile with a CCD camera to follow the evaporation kinetics of each drop. We observed a strong correlation between the temperature difference within the drop and the evolution of drop shape during different modes of evaporation (i.e. constant radius, angle or stick-slip) resulting in different Marangoni flow patterns. Under uniform heating, stable recirculatory vortices due to Marangoni convection emerged at high temperature which faded at later stages of the evaporation process. On the other hand, in the localized heating case, the constant heat flux resulted in a rapid increase of the temperature difference within the drop capable of sustaining Marangoni flows throughout the evaporation. Surface wettability was found to also play a role in both the emergence of the Marangoni flows and the evaporation kinetics. In particular, recirculatory flows on hydrophobic surfaces were stronger when compared to hydrophilic for both uniform and local heating. To quantify the effect of heating mode and the importance of Marangoni flows, we calculated the evaporative flux for each case and found to it to be much higher in the localized heating case. Evaporative flux depends on both diffusion and natural convection of the vapor phase to the ambient. Hence, we estimated the Grashof number for each case and found a strong relation between natural convection in the vapor phase and heating regime or Marangoni convection in the liquid phase. Subsequently, we demonstrate the limitation of current diffusion-only models describing the evaporation of heated drops. 32 90°, the CCA mode of evaporation is reported and the 33 decrease in weight/volume is observed to be non-linear. 34 Further, the decrease in volume according to a power law 35 is reported for drops evaporating on hydrophobic and su-36 perhydrophobic surfaces [8, 9]. Apart from the extreme 37 modes of evaporation (CCR and CCA), a stick-slip mode 38 of evaporation with repetitive cycles of stick and slip of 39 the contact line is observed for pure fluids [10] and also 40 for colloidal suspensions [11]. The strong influence of 41 substrate wettability [8, 12], shape of the sessile drop 42 [13], ambient conditions [14-16] and substrate proper-43 ties [17, 18] on the evaporation process are extensively 44 reported. 45 For a sessile drop in contact with a solid substrate, 46 the evaporative flux at the liquid-vapor interface is non-47 uniform and depends on the drop shape [19]. The evap-48 orative flux is higher near the contact line for drops with 49 contact angles less than 90°, whereas for d...

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“…It should be pointed out that the isopropanol is semi-transparent to infrared at the wavelengths of (7-14) μm, which means that the temperature distribution captured by the infrared camera is the temperature signature of the liquid layer very close to the droplet surface. Moreover, it is worth mentioning that the infrared thermal imaging technology has been applied in many sessile droplet evaporation researches [22][23][24]. Therefore, it is reliable to capture the surface temperature in present experiments.…”

Section: Experimental Techniquementioning

confidence: 96%

Evolution of thermal patterns during steady state evaporation of sessile droplets

Zhang

et al. 2018

Experimental Thermal and Fluid Science

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The steady state evaporation process of sessile isopropanol droplets was experimentally investigated by utilizing the infrared thermography. The steady state was achieved by replenishing the droplet from its base. Results indicate that once the evaporation is initiated, the interfacial temperature closed to the triple line is higher than that at the apex, which induces a thermocapillary flow along the interface from the contact line to the apex. With the increase of the evaporation rate, the temperature gradient is enlarged; the flow is enhanced and loses its stability. Then, several thermal patterns, including the forked pattern, the curved hydrothermal waves, the rosebud pattern and the petal-like pattern, were observed. The evolution of thermal pattern is highly correlated with the droplet height and the thermal wave number increases with the substrate temperature. Meanwhile, the global evaporation rate is higher and the surface flow is more intense on copper substrate than that on aluminum substrate.

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Effect of ambient temperature and relative humidity on interfacial temperature during early stages of drop evaporation

Cited by 90 publications

References 36 publications

Exploring Dependence of COVID-19 on Environmental Factors and Spread Prediction in India

Exploring Dependence of COVID-19 on Environmental Factors and Spread Prediction in India

Evaporation kinetics of pure water drops: Thermal patterns, Marangoni flow, and interfacial temperature difference

Evolution of thermal patterns during steady state evaporation of sessile droplets

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