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The present study is focused on exploring the use of air-assisted electrical discharge machining (AAEDM) of high carbon high chromium die steel. One of the notable drawbacks of conventional EDM machining is low material removal rate (MRR). So, there is a critical need to evolve a method that can increase the MRR of conventional EDM process. This experimental study is focused on the use of compressed...
The flow behavior of nanoquasicrystalline $$\hbox {Al}_{93}\hbox {Fe}_{3}\hbox {Cr}_{2}\hbox {Ti}_{2}$$ Al93Fe3Cr2Ti2 alloy at different strain rates and elevated temperatures was represented by the Johnson–Cook model, a modified Johnson–Cook model, a newly modified Johnson–Cook model, and a modified Zerilli–Armstrong model. A comparative study on the capability of the four models to accurately predict...
This article scrutinizes the influence of chemical reactions on flow of an Oldroyd-B fluid due to stretched cylinder. In vision of non-Fourier heat flux model, the heat transfer phenomenon is scrutinized. This enhanced constitutive model anticipates the time space upper-convected derivative which is recycled to depicting heat conduction mechanism. Additionally, heat transfer scrutiny is considered...
CL50WS material has been mainly used in tooling industries for making die, tool insert, mould or casting die. As the manufacturing of the CL50WS material parts from the DMLS machine differs from the conventional machining process, it is very essential to understand of DMLS behaviour and determine the proper optimal process parameter. Hence, the present study highlights the application of Box–Behnken...
Nowadays polylactic acid (PLA) is widely used in orthopedics surgeries as implants material due to well mechanical characterization and biomedical properties. But the PLA implants suffer from slow degradation rate when it is used in real-life scenario. In the present research work, the PLA specimens using additive manufacturing technique are fabricated and further assessed for mechanical characterization...
As an emergent expertise, there is a serious necessity for enhancing the low thermal conductivity of conventional liquids is to improve proficient heat transfer liquids in numerous solicitations. By diffusing nanometric materials in a certain base liquid, this obligation can be attained and resulting nanoliquid improved the thermal conductivity of the base liquids. Nanofluids are liquid interruptions...
Dynamic response of simply supported single-walled carbon nanotubes (SWCNTs) with moving nanoparticle is studied based on nonlocal continuum mechanics formulations. The new differential equation of motion is proposed by considering the effect of inertia and Coriolis forces due to nanoparticle movement. The viscoelastic behavior of the SWCNTs is established by Kelvin–Voigt viscoelastic model. The governing...
In this paper, a biomass gasification-based molten carbonate fuel cell (MCFC)-integrated advanced power system has been modelled and analyzed. The proposed system consisted of a biomass gasifier with hot gas cleaning equipment, a MCFC module, an indirectly heated air turbine and an organic Rankine cycle. Energetic, exergetic and economic (3E) analyses of the proposed power generation have been carried...
The aim of this article is to investigate the heat and mass diffusion (Cattaneo–Christov model) of the upper convected Maxwell nanomaterials passed by a linear stretched surface (slip surface) near the stagnation point region. Convocational Fourier’s and Fick’s laws are employed to investigate heat and mass diffusion phenomena. Using the similarity transformations, the governing PDEs are rendered...
This paper presents fundamental results from experimental investigations of shear/pressure-driven internal flow boiling of FC-72 in a horizontal test section of total flow channel length 1000 mm, gap height 2 mm, and width 15 mm. It compares effects of the frequencies of vapor and liquid pressure fluctuations (pulsations) on the experimentally measured heat-flux rates and heat transfer coefficients...
The present study has been carried out to analyse the effect of the laser shock peening (LSP) with the absence of a coating on titanium alloy (Grade 5—Ti6Al4V) and to establish the best set of LSP parameters for enhanced surface characteristics. Ti6Al4V which has excellent mechanical properties is penned using Nd:YAG pulsed laser with 2D XY translation with water as confinement medium. Power density...
After applying the diamond-like carbon (DLC) coating and surface micro-texturing into dry gas seal, the friction performance of textured surface DLC film of high pressure dry gas sealing ring has been researched in this paper. Firstly, the variation curves of friction coefficient with different load, rotation speed, and micro-texture geometric parameters are measured by using end-face friction and...
This paper firstly presents a novel 4-SPS/S (active chain/passive chain) parallel manipulator (PPM) driven by four pneumatic artificial muscles (PAMs). SPS denotes a spherical pair–prismatic pair–spherical pair chain and S denotes a spherical pair chain. The PPM proposed can be utilized as shoulder, wrist, waist, hip and ankle simulators or ankle rehabilitation robot. And we present a comprehensive...
There is still room to establish a methodology to optimise marine propellers, considering design requirements of the vessel, and match it to an electric motor. The method proposed herein consists in an optimisation whose objective function is power required in the electric motor shaft, and design variables are the parameters of Wageningen B-screw series propellers. A differential evolution optimisation...
Fused deposition modeling (FDM) is one of the most popularly used additive manufacturing techniques to manufacture complex geometry thermoplastic polymer parts. In FDM, during solidification process, the extruded filament called as roads gets bonded with the adjacent roads forming a layer and hence the entire part. Time-dependent thermal behavior of the polymer material decides the structural integrity...
The short-circuit gas metal arc welding has been continuously studied over the years, due to its important role in manufacturing processes. Concerning the process, many kinds of research are carried out aiming to understand the influence of the shielding gas in welds quality. In this context, this work treats the voltage and current welding signals as time series and applies a feature extraction based...
The head-on collision between two oil drops in a vertical channel is investigated numerically by using a volume-of-fluid method. Three-dimensional simulations are examined for laminar, fully developed, unsteady, and incompressible fluid flow. The effects of the Weber and Reynolds numbers and the density ratio on the collision dynamics are investigated before and after the drop coalescence. The results...
The present work investigates the mechanical properties of continuous carbon fiber-reinforced thermoplastic by testing composite specimens which were manufactured using an innovative process based on the fused filament fabrication (FFF, analogous to FDM®). The adopted testing procedures and their results are presented, as well as an introduction to the manufacturing process, which is patented by Markforged...
This paper presents a semi-analytical micromechanical model for evaluation of effective thermal conductivity of composite materials with periodic microstructure. The model is based on the equivalent inclusion thermal problem and utilizes Fourier series for representation of periodic functions involved in the material homogenization approach. Two main objectives can be highlighted in the work. The...
Finned tubes exist in diverse geometric configurations, usually the convective heat transfer coefficient is unknown and approximated as that for a geometry similar to the actual one. This paper presents a numerical investigation about the convective heat transfer in a horizontal finned tube. Ten geometric configurations were considered, which differed on the distance between fins, and two materials...
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