Blar i Institutt for maskin- og marinfag på dokumenttype "Journal article"
Viser treff 21-40 av 97
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Eco-friendly and low-cost nanofluid for direct absorption solar collectors
(Peer reviewed; Journal article, 2023)Nanofluids are promising receivers for solar collectors with volumetric absorption. These solar collectors are 1.2…1.4 times more efficient than conventional technology. However, most of the considered nanofluids are ... -
Eulerian CFD model of direct absorption solar collector with nanofluid
(Peer reviewed; Journal article, 2020)Solar energy is the most promising source of renewable energy. However, the solar energy harvesting process has relatively low efficiency, while the practical use of solar energy is challenging. Direct absorption solar ... -
Experimental and numerical investigation of direct absorption solar collectors (DASCs) based on carbon black nanofluids
(Peer reviewed; Journal article, 2023)Direct absorption solar collectors (DASCs) typically achieve high efficiency due to the volumetric heat absorption process facilitated by the working fluids. In this study, carbon black (CB) nanofluids were utilized as the ... -
Experimental investigation of erosion due to nanofluids
(Peer reviewed; Journal article, 2022)The demand for efficient and sustainable energy is continuously increasing. Among the many technologies with great potential within this field are nanofluids. Nevertheless, there is still a considerable lack of information ... -
Experimental study of hydrogen production using electrolyte nanofluids with a simulated light source
(Peer reviewed; Journal article, 2022)In this research, we conducted water electrolysis experiments of a carbon black (CB) based sodium sulfate electrolyte using a Hoffman voltameter. The main objective was to investigate hydrogen production in such systems, ... -
An experimental study on the effects of winglets on the tip vortex interaction in the near wake of a model wind turbine
(Peer reviewed; Journal article, 2020)An experimental study of the near wake up to four rotor diameters behind a model wind turbine rotor with two different wing tip configurations is performed. A straight‐cut wing tip and a downstream‐facing winglet shape are ... -
Experiments on the wake flow behind different configurations of multirotor wind turbines
(Peer reviewed; Journal article, 2023)Multirotor wind turbine concepts have recently emerged as a promising alternative to conventional turbines. When arranged in farms, the wake flow behind multirotor assemblies becomes an important factor in the cost-of-energy ... -
Experiments on upstream induction and wake flow for multirotor wind turbines
(Peer reviewed; Journal article, 2023)Multirotor wind turbine concepts are increasingly discussed as cost-effective alternatives for floating wind energy installations. When multiple smaller rotors are installed next to each other, the individual rotors ... -
Exploring the use of nanofluids in pump-free systems for solar thermal applications
(Peer reviewed; Journal article, 2023)By using nanofluids as a working fluid in pump-free designs, thermal energy systems can become more efficient and have reduced maintenance costs, ultimately extending the system’s lifespan. In this paper, our goal is to ... -
Extension of the hard-sphere model for particle-flow simulations
(Peer reviewed; Journal article, 2020)Discrete element methods require appropriate models for particle-particle collisions. Usually, researchers use soft-sphere types of models where the collision dynamics is solved numerically. This makes the simulation ... -
Fast moving smoldering fronts in thin liquid fuel films dispersed on inert porous media
(Peer reviewed; Journal article, 2022)An experimental study of smoldering in thin layers of pyrolysis oil on an inert substrate of calcium silicate boards has been conducted. The smoldering fronts propagated with velocities up to 0.4 mm/s, which is significantly ... -
Fault detection of a wind turbine generator bearing using interpretable machine learning
(Peer reviewed; Journal article, 2023)During its operational lifetime, a wind turbine is subjected to a number of degradation mechanisms. If left unattended, the degradation of components will result in its suboptimal performance and eventual failure. Hence, ... -
Field study of a direct absorption solar collector with eco-friendly nanofluid
(Peer reviewed; Journal article, 2024)The concept of direct absorption solar collector (DASC) was introduced in the 1970s. Multiple laboratory studies proved that nanofluid-based DASCs presented a fruitful alternative to conventional solar collectors. However, ... -
Flow loop study of a cold and cohesive slurry. Pressure drop and formation of plugs
(Peer reviewed; Journal article, 2022) -
Fluid-Structure Interaction Simulation of Flow Control Valve
(Journal article, 2020)Flow control valves are commonly used in fluid power systems. Controlled by proportional solenoid allows to control flow rate irrespective of pressure on inlet or outlet of the valve. Simulation of such valve is complex ... -
Grid Turbulence Measurements With an Acoustic Doppler Current Profiler
(Peer reviewed; Journal article, 2024)The motivation for this study is to investigate the abilities and limitations of a Nortek Signature1000 acoustic Doppler current profiler (ADCP) regarding fine-scale turbulence measurements. Current profilers offer the ... -
Hybrid Nanofluid in a Direct Absorption Solar Collector: Magnetite vs. Carbon Nanotubes Compete for Thermal Performance
(Peer reviewed; Journal article, 2022)The paper presents the experimental measurements of thermal efficiency of a tubular direct absorption solar collector (DASC) with a hybrid nanofluid based on magnetite (Fe3O4) and multi-walled carbon nanotubes (MWCNT). The ... -
Hydrodynamic modelling of a multi-body wave energy converter using the Moving Frame Method
(Peer reviewed; Journal article, 2023)Significant wave energy conversion may be achieved with multiple floats with several modes of motion combining constructively to generate power. With the M4 system, power take off is at hinges to absorb resulting pitch ... -
Induced drag in two dimensions in ideal fluids
(Peer reviewed; Journal article, 2019)In this paper we suggest a model for how a significant part of the drag forces on two-dimensional objects can be derived using the circulation that is naturally maintained around the objects. We assume incompressible and ... -
The Influence of Oil Contamination on Flow Control Valve Operation
(Peer reviewed; Journal article, 2022)This study presents CFD simulations of the flow of contaminated oil inside a control valve to investigate the influence of solid contaminants on the valve operational features. The Euler-Lagrange approach has been used to ...