Browsing NTNU Open by Author "Fernandino, Maria"
Now showing items 21-40 of 43
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Modeling of a centrifugal separator for dispersed gas-liquid flows
Monsen, Gisle Otto Tviberg (Master thesis, 2012)Natural gas is a vital component of the worlds supply of energy. In Norway all the gas can be found offshore where it needs to processed before transport. A vital part of the processing is gas and liquid separation. Current ... -
Numerical simulation of a droplet-film collision using a phase-field approach
Tengs, Erik Os (Master thesis, 2016)Computational Fluid Dynamics is the science of solving the governing equations of fluid motion numerically. Simulating multiphase flow has traditionally been difficult, due to non-uniform fluid properties and challenges ... -
Numerical solution of cahn-hilliard system by adaptive least-squares spectral element method
Park, Keunsoo; Gerritsma, Marc; Fernandino, Maria (Journal article, 2018)There is a growing interest in the phase-field approach to numerically handle the interface dynamics in multiphase flow phenomena because of its accuracy. The numerical solution of phase-field models has difficulties in ... -
Numerical Study of Wave Characteristics during Density Wave Oscillations in a horizontal, heated Channel
Lian, Jørn (Master thesis, 2014)Boiling flow in steam generators, water cooled reactors and other multiphase processes can be subject to instabilities. One of the main types of instabilities is DWO, a low amplitude and high frequency phenomenon. DWO can ... -
On the occurrence of superimposed density wave oscillations on pressure drop oscillations and the influence of a compressible volume
Park, Il Woong; Fernandino, Maria; Dorao, Carlos Alberto (Journal article; Peer reviewed, 2018)Although two-phase flow instabilities are attributed to be one of the impediments for achieving high heat flux in boiling systems, most of their fundamental characteristics remain uncharted. In particular, pressure drop ... -
On the scaling of convective boiling heat transfer coefficient
Paul, Subhanker; Fernandino, Maria; Dorao, Carlos Alberto (Peer reviewed; Journal article, 2021)Flow boiling has been widely used during the last century, but the key mechanisms controlling the heat transfer process still remain elusive. In the particular case of convective flow boiling inside a heated pipe, most of ... -
The overlooked role of pressure oscillations on heat transfer deterioration during self-sustained flow oscillations
Paul, Subhanker; Paul, Suparna; Fernandino, Maria; Dorao, Carlos Alberto (Peer reviewed; Journal article, 2020)The naturally occurring oscillations during flow boiling inside a heated pipe under specific conditions are known to hinder the system performance. Although substantial research has been done to reveal the occurrence and ... -
Phase-Field Models for Two-Phase Flows Using the Least-Squares Method
Park, Keunsoo (Doctoral theses at NTNU;2017:299, Doctoral thesis, 2017)The correct representation of the interface dynamics in two–phase flows plays an important role in the understanding of multiphase flow phenomena. There are many numerical methods available to describe the interface dynamics, ... -
Reconsidering the influence of the mass flux during nucleate flow boiling in a horizontal heated pipe
Paul, Subhanker; Paul, Suparna; Fernandino, Maria; Dorao, Carlos Alberto (Journal article; Peer reviewed, 2021) -
A redefined energy functional to prevent mass loss in phase-field methods
Kwakkel, Marcel; Fernandino, Maria; Dorao, Carlos Alberto (Peer reviewed; Journal article, 2020)Phase-field modeling has gained considerable attention for the study of two-phase systems. The method consists of introducing a field that can represent the state of matter or the atomic species concentration. In this way, ... -
Relaxation phase during droplet impact on superhydrophobic surfaces with high contact angle hysteresis
Zhang, Wenjing; Dorao, Carlos Alberto; Fernandino, Maria (Peer reviewed; Journal article, 2023)The droplet impact process on a solid surface is divided into a spreading phase where the droplet reaches the maximum deformation followed by a retracting phase. However, in the case of surfaces with high contact angle ... -
Simple and general correlation for heat transfer during flow condensation inside plain pipes
Dorao, Carlos Alberto; Fernandino, Maria (Journal article; Peer reviewed, 2018)This work proposes a new general and simple model to determine the local flow condensation heat transfer coefficient inside plain pipes. The model considers two regimes corresponding to high mass fluxes and/or high ... -
Study of mist flow inside a vane pack geometry
Carlson, Fredrik; Talseth, Mauritz-Arne Olaisen (Master thesis, 2009)Vane pack demisters in the industry operate with natural gas at pressures up to 100 bara. A new vane pack has been compared with the traditional one used by the industry. The vane packs have been investigated through ... -
Surface waves modified by subsurface shear currents
Smeltzer, Benjamin K. (Doctoral theses at NTNU;2019:389, Doctoral thesis, 2019)This thesis presents work studying water waves propagating atop background shear currents. A growing body of research, to which this thesis contributes, indicates that accounting for the effects of shear currents are ... -
Thermal two-phase flow with a phase-field method
Park, Keunsoo; Fernandino, Maria; Dorao, Carlos Alberto (Journal article; Peer reviewed, 2018)Phase field methods have become of great interest for the simulation of droplet and bubble dynamics, moving free interfaces and more recently phase change phenomena. One example is the Navier–Stokes–Korteweg (NSK) equations. ... -
Toward Surfaces with Droplet Impact Robustness and Low Contact Angle Hysteresis
Ding, Wenwu; Dorao, Carlos Alberto; Fernandino, Maria (Peer reviewed; Journal article, 2022)Superhydrophobic surfaces show excellent water repellent performance. However, liquid impalement occurs when a droplet impacts on the surface at high velocity. To achieve higher resistance to liquid impalement at the same ... -
Two-phase Flow Instabilities during Flow Boiling and Control of Wettability by Micro-structured Surfaces
Park, Il Woong (Doctoral theses at NTNU;2018:245, Doctoral thesis, 2018)Boiling heat transfer is of relevance in a variety of applications in power and process industries. In spite of the vast research performed in the last decades, fundamental questions about mechanisms related to the boiling ... -
Visualization of condensation over micro-structured surfaces
Ciria Aylagas, Raul (Master thesis, 2016)Water condensation is an ubiquitous phenomenon that happens widely in nature. It is also used in industrial applications such as water harvesting, desalination systems, thermal management and power generation. Filmwise ... -
Water droplet dynamics on a heated nanowire surface
Auliano, Manuel; Auliano, Damiano; Fernandino, Maria; Zhang, Peng; Dorao, Carlos Alberto (Journal article; Peer reviewed, 2018)When a liquid droplet is deposited onto a heated surface, evaporation occurs. If the temperature of the surface is sufficiently high, bubbles are released from activated nucleation sites, making the heat transfer more ... -
Water Droplets Settling in Crude Oil: Effect of Neighbouring Droplets and Temperature
Sjursen, Kamilla Hauknes (Master thesis, 2014)Gravity separation is a critical operation in oil and gas processing, both in terms of attaining specifications for finished products and to protect equipment downstream of the gravity separator. Liquid-liquid gravity ...