Nikolaos Rogkas

Multiscale finite element modeling of graphyne-family reinforced polymer nanocomposites: A topology-controlled comparison

Stelios K. Georgantzinos, Georgios I. Giannopoulos, Grigorios Kostopoulos, Nikolaos Rogkas et autres

This study presents a unified multiscale finite-element framework for the comparative evaluation of γ-graphyne-family-reinforced polymer nanocomposites. Four planar carbon nanofiller topologies—graphyne, graphdiyne, graphyne-3, and graphyne-4—are represented through an atomistically informed structural-mechanics formulation and embedded within a common three-dimensional representative volume element comprising …

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Improving Efficiency in Pumpless ORC-based CHP Systems via Integrated Scroll Expander Parametric Design and Thermomechanical-CFD Analysis

Nikolaos Rogkas, Evangelos Syngounas, Ellada Mita, Nick Arapkoules et autres

Preprint of the paper presented at the ALTERNATIVE ENERGY SOURCES, MATERIALS, AND TECHNOLOGIES (AESMT’25) Conference, held on 14–15 May 2024 in Sofia, Bulgaria.

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Improving Efficiency in Pumpless ORC-based CHP Systems via Integrated Scroll Expander Parametric Design and Thermomechanical-CFD Analysis

Nikolaos Rogkas, Evangelos Syngounas, Ellada Mita, Nick Arapkoules et autres

Preprint of the paper presented at the ALTERNATIVE ENERGY SOURCES, MATERIALS, AND TECHNOLOGIES (AESMT’25) Conference, held on 14–15 May 2024 in Sofia, Bulgaria.

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Enhancing tribological properties of AA6082 through EDM-induced roughness and wettability control via nanostructuring

Dimitrios Skondras-Giousios, Nikolaos Rogkas, Panagiotis Karmiris-Obratański, Panagiotis Sarkiris et autres

This study examines the influence of induced surface roughness and wettability on the tribological performance of EDM-fabricated AA6082 surfaces. Five textures with crater-like morphologies were produced by varying machining parameters. Tribological behavior was assessed under dry and lubricated conditions using a pin-on-disc …

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Experimental datasets and supplementary videos associated with the article "Coupled Effect of Lubricant Fill Volume on Drag and Friction Torque of Dip-Lubricated Wet Clutches"

Nikolaos Rogkas

This record contains the experimental datasets and supplementary videos associated with the article “Coupled Effect of Lubricant Fill Volume on Drag and Friction Torque of Dip-Lubricated Wet Clutches”, published in the Journal of Tribology. More specifically, the record includes the experimental datasets …

Experimental datasets and supplementary videos associated with the article "Coupled Effect of Lubricant Fill Volume on Drag and Friction Torque of Dip-Lubricated Wet Clutches"

Nikolaos Rogkas

This record contains the experimental datasets and supplementary videos associated with the article “Coupled Effect of Lubricant Fill Volume on Drag and Friction Torque of Dip-Lubricated Wet Clutches”, published in the Journal of Tribology. More specifically, the record includes the experimental datasets …

Coupled Effect of Lubricant Fill Volume on Drag and Friction Torque of Dip-Lubricated Wet Clutches

Nikolaos Rogkas, Georgios Xypolias, Georgios Drakopoulos, Vasilios Spitas

Abstract Multidisc wet clutches are widely used in automotive and industrial power-transmission systems, and their performance is strongly influenced by operating conditions and the lubricating oil. In particular, the volume of lubricant in dip-lubricated clutches, or equivalently, the oil level with respect …

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OPTIMIZED OPERATION OF A COMBINED SOLAR AND WASTE HEAT DRIVEN HIGH TEMPERATURE HEAT PUMP FOR A FOOD INDUSTRY

Panteleimon Tzouganakis, Dimitrios C. Rakopoulos, Evangelos Bellos, Angelos Skembris et autres

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OPTIMIZED OPERATION OF A COMBINED SOLAR AND WASTE HEAT DRIVEN HIGH TEMPERATURE HEAT PUMP FOR A FOOD INDUSTRY

Panteleimon Tzouganakis, Dimitrios C. Rakopoulos, Evangelos Bellos, Angelos Skembris et autres

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Optimal groove design for viscous drag reduction in wet clutch lubrication to enhance energy-efficiency in power transmissions

Nikolaos Rogkas, Dimitrios Patsouras, Chalarampos Lazaridis, Pavlos Zalimidis et autres

Wet clutches are critical components in mechanical power transmission systems, enabling controlled torque transfer between rotating parts. However, when disengaged, viscous drag torque is generated, reducing the transmission efficiency. Surface texturing, particularly groove patterns, is commonly employed to modulate flow dynamics and …

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Strategies to predict and decrease flow rate pulsation in a rotary peristaltic pump with novel tube design

Alexandros Anastasiadis, Nikolaos Rogkas, Christos G. Manopoulos, Vasilios Spitas

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Dynamic simulation of high-pressure angle spur gears

Georgios Vasileiou, Nikolaos Rogkas, L. Gkimisis, Vasilios Spitas

The present work dwells with the dynamic modeling of high-pressure angle spur gears ranging from 30 to 35 degrees. The benefits and potential of such gears in terms of dynamic performance is explored. A custom optimized spur gear tooth root geometry is …

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