The urgent challenges posed by the energy crisis, alongside heat dissipation of advanced electronics, have embarked on a rising demand for development highly thermally conductive polymer composites. Electrospun composite mats, known their flexibility, permeability, high concentration and orientational degree fillers, stand out as one prime candidates addressing this need. This study explores efficacy boron nitride (BN) its potential alternative, silicon (SiN) nanoparticles, in enhancing...

We report experimental and numerical studies of combined natural magnetic convection a paramagnetic fluid inside cubical enclosure heated from below cooled above subjected to field gradient. Values the gradient are in range $9\ensuremath{\le}|\mathrm{grad}|{b}_{0}{|}^{2}|\ensuremath{\le}900$ T${}^{2}$/m for imposed strengths center superconducting magnet bore $1\ensuremath{\le}|{b}_{0}{|}_{\mathrm{max}}\ensuremath{\le}10$ T. Very good agreement between experiments simulation is obtained...

Considering the development of energy sector, distributed small-scale power generation, e.g., gas micro-CHP, is attracting considerable interest. In such installations, heat exchanger one key components possessing a significant influence on overall performance. Most studies concentrate units operating below 900 °C, which do not fulfil requirements micro-CHP. Therefore, there remains challenge to design compact with passive technologies transfer enhancement. This work describes implementation...

The paper presents findings of analysis the effect a strong magnetic field gradient on natural thermal convection paramagnetic fluid. study have been done in 3D annulus between horizontal coaxial concentric cylinders filled with inner cylindrical surface was heated and outer cooled. Measuring vessel has placed inside superconductive magnet. research divided into two parts order to validate theoretical model. In experimental part: an impact value Nusselt number for three various...

In the paper, original cylindrical heat exchanger with minijets (MJHE) was introduced. The systematic experimental analysis of prototype described special attention paid to such parameters as transfer effectiveness, rates, overall coefficients, and pressure drop. coefficients were determined based on Wilson plot method, most suitable approach for coefficient determination in exchangers complex geometry. thermal-hydraulic characteristics in-house manufactured MJHE water–water gas–water...

To solve the problem and to meet requirements of customers in field high heat fluxes transfer compact units, a new design plate exchanger with minichannels (minichannels PHE) was proposed. The aim construct effectiveness for purpose household cogeneration ORC system. In this paper experimental analysis an assembled prototype such described. attention paid its thermal performance coefficients under boiling conditions. Water ethanol were chosen as working fluids. maximal value transferred flux...

Abstract A tendency to increase the importance of so-called dispersed generation, based on local energy sources and working systems utilizing both fossil fuels renewable resources is observed nowadays. Generation electricity industrial or domestic scale together with production heat can be obtained for example through employment ORC systems. It mentioned in EU directive 2012/27/EU cogenerative electricity. For such crucial points are connected exchangers, which should small size but able...

Main objective of the paper was to experimentally investigate thermo-magnetic convection diamagnetic fluids in Rayleigh-Benard configuration. For better understanding magnetic field influence on phenomena occurring cubical enclosure following parameters were studied: absence or presence nanoparticles (single and two-phase fluids), thermal conditions (temperature difference range 5–25 K) strength (magnetic induction 0–10 T). A multi-stage approach undertaken achieve aim. The means that forces...

The magnetic convection of paramagnetic fluid is studied in a strong field. cubic enclosure heated from one vertical wall and cooled the opposite one. 80% mass aqueous solution glycerol with 0.8 mol/kg concentration gadolinium nitrate hexahydrate to make working paramagnetic. small amount liquid crystal slurry added order visualize temperature profiles cross-section. This system placed directly below solenoid superconducting magnet which oriented vertically. cold constantly controlled by...

The jet impingement phenomenon is one of the processes which can enhance heat transfer. Due to its complex nature, it has been subject many experimental and numerical analyses in researchers have tried quantify qualitatively describe it. However, lack crucial information regarding procedures, accuracy, geometry settings, boundary conditions, etc. makes challenging compare results, validate turbulence models, reproduce data. In this publication, authors show a consistent systematic analysis...

Since the nineties, when first nanofluid preparation was reported, nanofluids are attracting more and attention. It is mainly due to their potential in heat transport processes. Introduction of a strong magnetic field, as it done this studies, has same aim – transfer enhancement. Additional goal presented research connected with deep understanding weakly nanoparticles behaviour fluid, influenced by environment. Due opaqueness, not possible use optical experimental methods for investigations...

The main aim of this paper was to analyze possible utilization the low concentration nanofluids and magnetic field enhance heat transfer. studied fluids were based on water with an addition copper particles (40-60 nm diameter). They belonged diamagnetic group materials. As a first attempt stated target analysis enclosure placed in maximal value square induction gradient carried out. maximum centre investigated cavity it caused most complex system gravitational buoyancy forces. In lower part...

The magnetic convection of paramagnetic fluid in a cylindrical enclosure is studied experimentally and numerically. upper side wall the cylinder cooled lower heated, an unstable configuration. whole system placed coaxially bore superconducting magnet position minimum radial component buoyancy force at middle cross section enclosure. stable configuration— when inversely horizontal axial case are also considered. As aqueous solution glycerol with gadolinium nitrate hexahydrate used. isotherms...

We performed combined experimental and numerical studies of the flow heat transfer a paramagnetic fluid inside differentially heated cubical enclosure subjected to various strong non-uniform magnetic field gradients. Two different heating scenarios are considered: unstable (heated from below) stable above) initial thermal stratification. In contrast previously reported in literature, which observed solely laminar regimes, we investigated also appearance sustenance periodic- fully...

The experimental studies of the flow and heat transfer a paramagnetic fluid inside cubical enclosure in configuration heated from below subjected to various strong non-uniform magnetic field gradients are presented. In contrast previously reported literature, which observed solely laminar regimes, appearance sustenance periodic- fully transient – motions for very first time were investigated. This was consequence using significantly stronger gradient (up 900 T2/m) than those used previous...

The experimental, numerical and scaling analysis in the case of thermo-magnetic convection a thermosyphon-like enclosure filled with paramagnetic fluid is presented. Visualization temperature field together simulation gave an information about flow structure, which indicated "finger-like" structures hot cold streams advecting each other. Their number depended on Rayleigh also magnetic induction. In basis thermal measurements average Nusselt was determined for various strength presented...

The effect of a strong magnetic field on the temperature and velocity fields laminar flow was examined. magnetizing force gravity term were included in momentum conservation equation. Biot-Savart's law applied to obtain distribution field. Three-dimensional computations performed for straight pipe with elbow. single circular coil oriented perpendicularly axis divided two equal parts, while case elbow just at beginning wall first part adiabatic second isothermal. Half heated, reamining...