Explanipedia

Numerical Simulations of Thermodynamic Processes in the Chamber of a Liquid Piston Compressor for Hydrogen Applications Open

Valērijs Bezrukovs, Vladislavs Bezrukovs, Marina Koņuhova, Deniss Bezrukovs, Imants Kaldre , et al. · 2024

This paper presents the results of numerical simulations examining the thermodynamic processes during hydraulic hydrogen compression, using COMSOL Multiphysics® 6.0. These simulations focus on the application of hydrogen compression system…

Numerical Simulations of Thermodynamic Processes in the Chamber of Liquid Piston Compressor for Hydrogen Applications Open

Valērijs Bezrukovs, Vladislavs Bezrukovs, Marina Koņuhova, Deniss Bezrukovs, Imants Kaldre , et al. · 2024

This paper presents the results of numerical simulations examining the thermodynamic processes during hydraulic hydrogen compression, using COMSOL Multiphysics® 6.0. These simulations focus on the application of hydrogen compression system…

Correction to: MHD Flow in Simple Cubic Periodic Array Geometry Open

L. Buligins, I. Bucenieks, I. Grants, Imants Kaldre, Kalvis Kravalis , et al. · 2024

MHD Flow in Simple Cubic Periodic Array Geometry Open

L. Buligins, I. Bucenieks, I. Grants, Imants Kaldre, Kalvis Kravalis , et al. · 2023

The aim of this study is to investigate the behaviour of liquid metal flow in Capillary Porous System (CPS) under strong external magnetic field. Overlapping simple cubic (SC) periodic array of electrically non-conducting spheres with diam…

R&D of a Hydraulic Hydrogen Compression System for Refuelling Stations Open

Vladislavs Bezrukovs, Vladislavs Bezrukovs, Marina Koņuhova, Deniss Bezrukovs, Imants Kaldre , et al. · 2023

The article presents a hydraulic hydrogen compression solution designed to serve as a booster compressor. It can be adapted to changing parameters of the inlet pressure of hydrogen and allows stabilising the hydrogen accumulation process i…

MHD Flow in Simple Cubic Periodic Array Geometry Open

L. Buligins, I. Bucenieks, I. Grants, Imants Kaldre, Kalvis Kravalis , et al. · 2023

The aim of this study is to investigate the behavior of liquid metal flow in Capillary Porous System (CPS) under strong external magnetic field. Overlapping simple cubic (SC) periodic array of electrically nonconductive spheres with diamet…

Pulsed and Static Magnetic Field Influence on Metallic Alloys during Solidification Open

Mikus Milgrāvis, Ivars Krastiņš, Imants Kaldre, Matīss Kalvāns, A. Bojarevičs , et al. · 2023

Electromagnetic methods can be used to affect the solidification of metallic alloys. Combined alternating and static (DC) magnetic fields can induce pressure waves in liquid metals in a contactless manner, refining grain structure, prevent…

Directional Solidification of Aluminum A360 under Moderate DC Magnetic Field and Electric Current Open

Imants Kaldre, A. Bojarevičs, Mikus Milgrāvis, Toms Beinerts, Matīss Kalvāns · 2023

Metal additive manufacturing is rapidly developing technology, but its application in wider scale is limited by several factors. One of these is expensive raw material, because it requires certain physical properties. Two most popular meta…

TiO2-Assisted Microstructural Variations in the Weld Metal of EH36 Shipbuilding Steel Subject to High Heat Input Submerged Arc Welding Open

Yongwu Wu, Xiaobo Yuan, Imants Kaldre, Ming Zhong, Zhanjun Wang , et al. · 2022

Electromagnetic Processing during Directional Solidification of Particle-Strengthened Aluminum Alloys for Additive Manufacturing Open

Imants Kaldre, Mikus Milgrāvis, A. Bojarevičs, Toms Beinerts · 2021

The rise of metal additive manufacturing technology has increased the demand for high-performance alloys such as metal matrix composites (MMCs). The metallurgical production of MMCs remains a challenge. The nano-powder of dielectric partic…

Titanium production by magnesium thermal reduction in the electroslag process Open

Ernests Platacis, Imants Kaldre, Ervīns Blumbergs, Linards Goldšteins, Vera Serga · 2019

Titanium is widely used in specific applications due to its high strength, low density and good chemical stability. Despite it is one of the most abundant elements in the earth’s crust, it is very expensive, because production of pure meta…

Electroslag process for better titanium deposition morphology Open

E. Platacis, Imants Kaldre, Ervīns Blumbergs, Vera Serga · 2018

Permanent magnet dipole stirrer for aluminium furnaces Open

Toms Beinerts, A. Bojarevičs, R. Baranovskis, Mikus Milgrāvis, Imants Kaldre · 2018

Use of permanent magnet systems for metallurgical applications have been proposed before. We have continued development of such systems by investigation use of single magnetic dipole which is realized as permanent magnet cylinder. Magnet i…

Contactless electromagnetic method for aluminium degassing Open

Imants Kaldre, A. Bojarevičs, Toms Beinerts, R. Baranovskis, Raimonds Nikoluškins , et al. · 2018

Degassing of aluminium alloys is an important technological step. In this work the idea and mathematical, and numerical description of electromagnetic aluminium degasser is presented. Experimental electromagnetic device for degassing alumi…

Direct chill casting of aluminium alloys under electromagnetic interaction by permanent magnet assembly Open

A. Bojarevičs, Imants Kaldre, Mikus Milgrāvis, Toms Beinerts · 2018

Direct chill casting is one of the methods used in industry to obtain good microstructure and properties of aluminium alloys. Nevertheless, for some alloys grain structure is not optimal. In this study, we offer the use of electromagnetic …

Thermoelectric current and magnetic field interaction influence on the structure of binary metallic alloys Open

Imants Kaldre · 2018

Lorsqu'un champ magnétique est appliqué au cours de la solidification directionnelle, une convection dans la phase liquide peut être induite par l'effet thermoélectrique. En effet la présence d'un gradient de température le long du front d…

Casting technology for ODS steels – dispersion of nanoparticles in liquid metals Open

Mārtiņš Sarma, I. Grants, Imants Kaldre, A. Bojarevičs, G. Gerbeth · 2017

Dispersion of particles to produce metal matrix nanocomposites (MMNC) can be achieved by means of ultrasonic vibration of the melt using ultrasound transducers. However, a direct transfer of this method to produce steel composites is not f…

Two cylinder permanent magnet stirrer for liquid metals Open

A. Bojarevičs, R. Baranovskis, Imants Kaldre, Mikus Milgrāvis, Toms Beinerts · 2017

To achieve a uniform liquid metal composition and temperature distribution, stirring is often necessary for industrial processes. Here, a novel permanent magnet system for liquid melt stirring is proposed. It promises very low energy consu…

Assessment of Linear Permanent Magnet Liquid Metal Dispenser Open

Matīss Kalvāns, A. Bojarevičs, Imants Kaldre, Toms Beinerts · 2016

A new type of a liquid metal pump has been developed for efficient contactless dispensing out of industrial metal furnaces. The concept consists of two opposing arrays of cylindrical diametrically magnetized synchronously rotating permanen…

Directional solidification of metallic alloys under pulsed transverse electromagnetic force Open

Imants Kaldre, A. Bojarevičs · 2015

Magnetically induced acoustic cavitation for production of metal matrix nano-composites Open

I. Grants, G. Gerbeth, Imants Kaldre, A. Bojarevičs, Mārtiņš Sarma · 2015

A steady axial magnetic field is applied to a liquid metal zone heated by induction currents. This zone is supported from the top and the bottom by water cooled rods in an evacuated cell. The resulting alternating Lorentz force causes pres…

Metal matrix nanocomposite production using contactless electromagnetic interaction Open

A. Bojarevičs, Toms Beinerts, Imants Kaldre, I. Grants, G. Gerbeth · 2015

Metal matrix nano composites (MMNC) are a class of composite materials where nano and micro scale dielectric particles are evenly distributed in metal matrix. Such materials may have qualitatively different properties and thus specific app…

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