Arctic oil spills are particularly detrimental as they could cause extensive ice melting in addition to the environmental pollution they create. Floating oil slicks amongst ice floes absorb ambient energy and transfer that energy to the ice to aggravate melting in the thaw season. However, few studies have been undertaken to reveal how oil-ice interactions impact ice melting. This research employs a measurement technique to investigate the heat transfer pathways from oil slicks to the ice. Dual-luminescence imaging and particle imaging velocimetry (PIV) in a side cooled cavity is performed for temperature and velocity measurements of Toluene, respectively. Dual-luminescence imaging captured the spatial temperature distribution of the fuel. Consecutive imaging of the seeding particles in PIV provided the spatial velocity field of the fuel in the cavity. The results show that the convective field is directly coupled with the temperature field, i.e., the temperature difference instigates a flow in the liquid. Successful implementation of the two measuring techniques together is a step toward analyzing heat transfer pathways in a liquid fuel adjacent to an ice body, indicating the extent of melting.
DUAL-LUMINESCENCE IMAGING AND PARTICLE TRACKING VELOCIMETRY FOR SIMULTANEOUS TEMPERATURE AND VELOCITY FIELD MEASUREMENTS IN HYDROCARBONS LIQUID
Arctic oil spills are particularly detrimental as they could cause extensive ice melting in addition to the environmental pollution they create. Floating oil slicks amongst ice floes absorb ambient energy and transfer that energy to the ice to aggravate melting in the thaw season. However, few studies have been undertaken to reveal how oil-ice interactions impact ice melting. This research employs a measurement technique to investigate the heat transfer pathways from oil slicks to the ice. Dual-luminescence imaging and particle imaging velocimetry (PIV) in a side cooled cavity is performed for temperature and velocity measurements of Toluene, respectively. Dual-luminescence imaging captured the spatial temperature distribution of the fuel. Consecutive imaging of the seeding particles in PIV provided the spatial velocity field of the fuel in the cavity. The results show that the convective field is directly coupled with the temperature field, i.e., the temperature difference instigates a flow in the liquid. Successful implementation of the two measuring techniques together is a step toward analyzing heat transfer pathways in a liquid fuel adjacent to an ice body, indicating the extent of melting.
more »
« less
- Award ID(s):
- 1938976
- NSF-PAR ID:
- 10303811
- Date Published:
- Journal Name:
- the ASME 2021 Fluid Engineering Division Summer Meeting FEDSM2021
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
more » « less
Abstract -
Arctic oil spills are particularly detrimental as they cause extensive ice melting in addition to the environmental pollution they create. However, few studies have been undertaken to reveal how oil-ice interactions impact ice melting. A simultaneous measurement method is developed to investigate the heat transfer pathways from oil slicks to ice. Functional luminescent probes are dissolved in a liquid immiscible with water, which imitates spilled oil. Another luminescent probe is added to seeding particles in order to increase their luminescent intensity. Dual-luminescence imaging and particle imaging velocimetry (PIV) are combined into a single simultaneous measurement method. The developed measurement system shows simultaneous temperature and velocity measurements for natural convection of the immiscible liquid. Successful implementation of the two measurement techniques together is a step toward analyzing heat transfer pathways in a spilled oil adjacent to an ice body, which indicates the extent of melting.more » « less
-
Crude oil is accidentally released into open water each year. Since the released oil is harmful to the environment, the trajectory needs to be predicted in order to remove the oil minimizing the polluted area by oil. The prediction of the spilled oil trajectory becomes complicated when the ice is present like in Arctic Ocean. When the oil is adjacent to ice, the oil causes the ice melting. In order to simulate this ice melting, the heat transfer between oil and ice needs to be understood. Spatial- and time-resolved temperature and velocity change in oil are required. Several optical measurement techniques can provide spatial- and time-resolved information in fluids, however, none of those techniques are available to measure the temperature and velocity distribution in oil simultaneously. In this research, the simultaneous thermometry and velocimetry in oil is accomplished by combining Dual Luminescence Imaging (DLI) for thermometry and Particle Image Velocimetry (PIV). Pyranine-induced particles are used for PIV. By selecting proper luminophores for DLI, temperature and velocity distributions in oil can be captured by a color camera in the developed method. With this technique, the ice melting is studied and will be discussed in the presentation.more » « less
-
A series of experiments were conducted to investigate the melting of ice adjacent to a water-immiscible liquid layer (n-dodecane) exposed to radiation from above. The experimental setup consisted of a borosilicate container containing an ice wall and a layer of n-dodecane heated from above. In addition to tracking the movement of the melt front, Particle Image Velocimetry (PIV) and Background Oriented Schlieren (BOS) measurements were conducted on the liquid-phase . Two distinct melting regimes were found to dominate the melting process. First was the uniform melting across the contact area with the immiscible liquid layer for low radiation levels (~1 kW/m 2 ). Second was the lateral intrusion regime, where a depression near free surface of the liquid forms in ice and grows laterally for radiation level greater than ~1 kW/m 2 . The ice surface remained flat and smooth in uniform melting regime, whereas in the lateral intrusion regime a series of rivulets were formed that carved valleys on the ice. PIV measurements showed a surface flow toward the ice for all heat flux levels caused by surface-tension forces. Increase of the heat flux levels caused a transition to multi-roll structure in the flow field. This multi-roll structure, which is accompanied by a recirculation zone near the ice, increased heat transfer coefficient near the surface of the liquid causing lateral intrusion regime. BOS measurements indicated presence of density gradients below the free surface of n-dodecane and in regions near ice that are caused by local small-scale temperature gradients. The current experiments were conducted to explore the melting dynamics and to shed light on the processes that influence the ice melting. Implications of such mechanisms in a real-life scenario, i.e. oil spill in ice-infested waters, needs to be explored further by using more liquids and improved accuracy with diagnostic techniques.more » « less
-
A series of experiments were conducted to investigate the flow field of a top-heated liquid fuel adjacent to an ice block. The experimental setup consisted of a borosilicate container containing an ice wall and a layer of n-heptane heated from above. Particle Image Velocimetry (PIV) and Background Oriented Schlieren (BOS) measurements were conducted on the liquid -phase. PIV measurements showed a surface flow toward the ice caused by surface -tension forces, which is driven by the horizontal temperature gradients on the liquid surface. A recirculation zone was observed under the free surface and near the ice. The combination of the two flow patterns caused lateral intrusion in the ice, instead of a uniform melting across ice surface. BOS measurements indicated presence of density gradients below the free surface of n-heptane and in regions near the ice block. These density gradients were created by local small-scale temperature gradients. The current experiments were conducted to explore the processes that influence the ice melting by immiscible liquid layers.more » « less
- Free Publicly Accessible Full Text
-
Accepted Manuscript1.0
- Conference Paper:
- The DOI is not currently available.
