Lovrenc Novak

Lovrenc Novak
University of Ljubljana · Faculty of Mechanical Engineering

PhD

About

19
Publications
4,162
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154
Citations
Citations since 2017
9 Research Items
106 Citations
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20172018201920202021202220230102030

Publications

Publications (19)
Article
Full-text available
Slovenia is a Central European country with a long history of hydropower. This paper gives a brief introduction to the current status of hydropower utilization and informs about some selected successful examples of hydropower plant operation. One such example is fish passage and flood risk reduction on the lower reaches of the Sava River at the Bre...
Article
Full-text available
This work investigates the evenness of fabric drying in a household heat pump tumble dryer. The evenness of drying was defined as the standard deviation of the fraction of water, evaporated from each fabric item. Drying experiments were performed according to the IEC 61121 standard, which was also followed to determine quantities and types of cotto...
Article
Full-text available
The influence of a bulb runner blade hydrofoil shape on flow characteristics around the blade was studied. Experimental work was performed on a bulb turbine measuring station and a single hydrofoil in a cavitating tunnel. In the cavitation tunnel, flow visualization was performed on the hydrofoil’s suction side. Cavitation structures were observed...
Article
Full-text available
Drying of the sewage sludge layer was investigated in a convective laboratory dryer at air temperatures of 65 °C and 80 °C and air speeds of 0.53 m/s and 0.83 m/s. The sludge layer was formed by loading cylindrical extrudates on a grate of 0.5 m × 0.5 m size. The drying air was directed through the layer, as typically encountered in industrial belt...
Article
Full-text available
The present study investigates fabric motion in the drum and its effect on performance parameters of a domestic heat pump tumble dryer in several operating points, defined by different load masses and drum speeds. Fabric motion in the drum was recorded by using a high-speed camera and evaluated statistically in order to determine the relation betwe...
Article
In this paper we discuss energy storage requirements for EUSALP region in Europe. EUSALP is an Alpine region that includes the entirety Switzerland, Austria, Slovenia, and Lichtenstein, as well as parts of France, Germany, and Italy. A model is presented that facilitates the estimation of the required technical amounts of energy storage and install...
Article
Full-text available
The use of heat pump tumble dryers is nowadays more common because they offer huge energy savings compared to conventional tumble dryers. Earlier studies made on conventional tumble dryers have shown that parameters such as heater power, fan speed, drum speed, weight and initial moisture content of textiles and air leakage have a huge impact on the...
Article
Full-text available
This study examines how the inlet air temperature, relative humidity, and flow rate influence the textile drying process in an open cycle tumble dryer. An experimental setup was prepared by connecting a domestic tumble dryer to an external system for controlled heating, humidification, and transport of air. Experiments were conducted by drying cott...
Article
Full-text available
The article presents an experimental and numerical study of vortex generation and shedding from a NACA 4421 airfoil at low Reynolds number. The experiment was conducted in a low-speed wind tunnel by flow visualization. A high-speed camera was used to record flow structures at the airfoil trailing edge. The recorded images were processed with an in-...
Article
Full-text available
This paper investigates the dust lifting phenomenon at the coal and iron ore stockpile at the Port of Koper, Slovenia. Dust lifting presents a serious environment and health hazard, thus the main objective of our study was to propose efficient measures for wind erosion reduction A numerical model of the stockpile was created using the computational...
Article
Full-text available
This paper presents a study of heat transfer in a rotating axial rotor. The study was done on the basis of computational fluid dynamics simulations and validated with an infrared 10 thermocamera experimental setup. The influence of full turbulence vs. Menter's boundary layer method was studied in terms of heat transfer and flow phenomena. Additiona...
Article
Full-text available
This paper presents a non-contact method for velocity field calculation from a series of fluid flow images with illuminated planar layer of the flow and a mixed-in pollutant for flow visualization. The velocity field is calculated using a model similar to optical flow that is based on the advection-diffusion equation. The model is evaluated using a...
Article
This article presents a measuring method for determination of convective heat transfer in rotating environments. The method is used to obtain temperature and Nusselt number distributions on optically accessible objects inside real operating environments, without the need for implementation of complex surface heat flux measurements. Temperature maps...
Article
Full-text available
This paper presents an experimental and CFD numerical study of convective heat transfer and flow field characteristics in a rotating environment. Surface temperature distribution on a rotating blade was measured by means of infrared thermography. The experimental facility, IR thermography method, and the CFD numerical model that was made according...
Article
Full-text available
This paper presents an experimental and CFD numerical study of convective heat transfer in a rotating cascade. Infrared thermography was used to measure surface temperature distribution on a rotating hollow blade, heated internally by secondary air. A CFD numerical model was made according to the actual test rig geometry and operating conditions. T...
Article
This paper presents an experimental and CFD numerical study of convective heat transfer and flow field characteristics in a rotating rotor cascade. Surface temperature distribution on a rotating heated blade was measured by means of infrared thermography, which proved highly advantageous over standard temperature sensors due to its completely non-i...
Article
Full-text available
A numerical approach is presented for determining the variation of rotational speed with convective heat transfer of blade structures. The investigated structure cooled by air was subjected to an axial hot air stream in a cross-flow system. In order to exclude the influence of undesirable aerodynamic flow forces, a simplified geometry was chosen an...

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Project (1)
Archived project
From the designer's viewpoint, the ideal situation would be to have at his disposal a fully predictive computational method which could dispense with model tests and be used at a preliminary design step. This is still far beyond present state of the art and erosion tests still have to be carried out. The scientific program is based on performing advanced experiments and simulations for accurate prediction of cavitation erosion.