Browsing NTNU Open by Author "Mhatre, Sameer"
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Coalescence Behavior of Stable Pendent Drop Pairs Held at Different Electric Potentials
Mhatre, Sameer; Hjartnes, Tomas; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)In this work, we studied the electrocoalescence behavior of stable pendent drop pairs and compared the results with clean drops, where the interface is void of surface-active compounds. The drop phase was brine and the ... -
Demulsification of crude oil emulsions tracked by pulsed field gradient NMR. Part II: Influence of chemical demulsifiers in external AC electric field
Hjartnes, Tomas; Mhatre, Sameer; Gao, Bicheng; Sørland, Geir; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)Crude oil emulsions can reach stability levels that pose severe challenges for the processing industry. Certain conventional methods are used to deal with these challenges, such as chemical demulsification. In this article, ... -
Demulsifier assisted film thinning and coalescence in crude oil emulsions under DC electric fields
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan; Xu, Zhenghe (Journal article, 2018)Electrocoalescence has been considered a most efficient method of crude oil dewatering; however, just electric fields are not enough when dealing with heavy crude oils. In this workwe studied effect of asphaltene flocculation ... -
Emulsions in external electric fields
Sjøblom, Johan; Mhatre, Sameer; Simon, Sebastien Charles; Skartlien, Roar; Sørland, Geir (Peer reviewed; Journal article, 2021)Water is co-produced with crude oils, generally in the form of water-in-crude oil emulsions. The oil and water phases need to be separated before export. Separation is performed in gravity separators with the addition of ... -
Experimental evidence of enhanced adsorption dynamics at liquid-liquid interfaces under electric field
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2020)In this work we investigate adsorption of surface active compounds at water-oil interface subjected to an electric field. A fluid system comprising a pendent water drop surrounded by an asphaltene-rich organic phase is ... -
Interfacial Dilational Rheology of Molecular Films in DC Electric Fields
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2022)We present a novel technique to measure the interfacial dilational rheology of a molecular film adsorbed at a water–oil interface in a direct-current (dc) electric field. A film of a highly polar subfraction of asphaltenes ... -
Methodology to calculate interfacial tension under electric field using pendent drop profile analysis
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2019)In this paper, we present a methodology to calculate interfacial tension of a water–oil interface under an electric field. The Young–Laplace equation, conventionally used to estimate surface/interfacial tension in axisymmetric ... -
Shape evolution of a water drop in asphaltene solution under weak DC electric fields
Mhatre, Sameer; Simon, Sebastien Charles; Sjøblom, Johan (Journal article; Peer reviewed, 2019)The microscopic shape change of a pendent water drop, surrounded by an organic solution containing asphaltenes extracted from heavy crude oil, under electric field is investigated. Weak constant DC electric fields were ...