Nanofluid Flows in Heat Exchangers Abdul Jabbar Ansari, Akshay Kumar Maurya Advances in Computational Fluid Dynamics, 2025 The growth imperative necessitates continuous improvement, leading to extensive research on enhancing heat transfer rates and reducing the costs and sizes of industrial plants through increased efficiency of heat exchangers. Recent years have witnessed numerous precise and valuable studies dedicated to exploring two-pipe heat exchangers. This chapter provides an in-depth examination of their developmental process and discusses techniques for improving heat transfer within these exchangers. To effectively illustrate the extensive research, the authors have compiled detailed information on various methods, including active, passive, and complex approaches. Notably, studies highlighting the use of passive techniques in DPHEs (double pipe heat exchangers) have been often referenced. Additionally, comprehensive discussions on the utilization of NFs (nanofluids) in DPHEs, as well as relevant findings, are presented. NFs serve as the first of the two necessary fluids for enhancing heat exchanger functionality by improving its rheological and thermal properties. This review delves into the effects of NPs (nanoparticles) on NF properties, specifically analyzing factors like NP size, concentration, and shape. The primary objective of this review is to offer fresh insights for future research. The concerns associated with the use of NPs in the internal tube to improve heat transfer in a DPHE are extensively addressed. The novel findings presented here have been thoroughly validated and provide support for considering various studies in this field.
Experimental Investigations of the Influence of Friction Stir Processing on Mechanical and Tribological Properties of Al/SiC Composite Materials Amit Tiwari, Abdul Jabbar Ansari Advances in Solid State Welding and Processing of Metallic Materials, 2025 Metal matrix composites (MMCs) have gained noteworthy attraction due to their potential for enhanced mechanical and tribological properties and improved performance in various applications. This research paper aims to examine the effect of silicon carbide (SiC) reinforcement on the microstructure, hardness, and tribological behavior of aluminum metal matrix composites (AMMCs) obtained via friction stir processing (FSP). The FSP process offers unique advantages such as excellent material mixing, refined microstructure, and improved interfacial bonding between the reinforcement particles and the matrix. Mechanical properties, including tensile strength, hardness, and wear resistance, were evaluated to assess the performance of the Al/SiC composites. The obtained results were compared with those of conventionally produced composites to determine the advantages of the FSP process. The research findings demonstrated that FSP led to refined grain structure, homogeneous circulation of SiC particles, and also improved interfacial bonding of reinforcement and matrix. Consequently, the Al/SiC composites exhibited enhanced mechanical properties, including improved tensile strength, hardness, and wear resistance compared to conventionally fabricated composites. The paper presents a comprehensive analysis of microstructural evolution, mechanical properties, and performance of the SiC/Al composites produced via FSP, with the help of the scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS).
Fabrication of Aluminium Surface Composites Synthesized through Friction Stir Processing: Optimization of Process Parameters through Response Surface Methodology Abdul Jabbar Ansari, Shaheer Ansari, Noor Alam Journal of Engineering Science and Technology Review, 2025 Friction stir processing (FSP) is an advanced and effective technique used to improve the surface characteristics of metal matrix composites.This experimental work examines the influence of FSP parameters, including tool rotational speed (TRS), tool traverse speed (TTS), and reinforcement particle (RP) percentage, on the development of Al6061-T6/SiC composites, aiming to enhance their mechanical properties.Aluminum metal matrix composites are developed through the reinforcement of SiC particles into the Al6061-T6 base material (BM).The results of this experimental study indicate that the RP percentage is the most critical parameter, as identified through the design of experiments using the response surface methodology (RSM) approach.The fabricated samples were evaluated through microhardness and tensile testing.Microstructural modifications were also observed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electron backscattered diffraction (EBSD) techniques.The SiC-reinforced surface composites exhibited significant improvements in both microhardness and tensile strength compared to the BM.The highest recorded ultimate tensile strength (UTS) and microhardness values, obtained at a 12% volume fraction of SiC particles, were 390 MPa and 150.5 HV, respectively.
Effect of Volume Percentage of Reinforcement on the Microstructure and Mechanical Properties of an Al6061-T6/SiC Surface Composite Fabricated Through Friction Stir Processing Abdul Jabbar Ansari, Mohd. Anas Advances in Science and Technology Research Journal, 2023 In this research, aluminium metal matrix composites (AMMCs) have been manufactured through friction stir processing (FSP) by reinforcing micro sized SiC particles in an Al6061-T6 alloy. The consequences of the volume percentage of reinforced SiC particles on mechanical properties and microstructural features were analyzed for the developed AMMCs. Microstructural evaluation of a cross-section of a friction stir processed (FSPed) sample has been conducted through Electron backscatter diffraction (EBSD) Energy dispersive spectroscopy (EDS) and a scanning electron microscope (SEM) technique. Microhardness tests were conducted athwart the cross section of FSPed specimen to obtain microhardness feature. A tensile test of FSPed samples has been conducted on a univer-sal testing machine (UTM). Homogeneous distributions of SiC particles were found in the stir zone without any consolidation of particles. The size of the reinforcement particles was decreased slightly by increasing the volume fraction. It has been found that increasing the volume fraction of SiC particles, enhance the tensile strength and microhardness, but decreases the ductility of the aluminium. The maximum ultimate tensile strength (UTS) and microhardness were obtained as 390 MPa and 150.71 HV, respectively, at 12% volume percentage of reinforce - ment particles. UTS and microhardness of the FSPed Al/SiC have been improved by 38.29% and 59.48% respec - tively as compared to Al6061-T6. The brittle nature of the FSPed Al/SiC has increased due to a rise in the volume fraction of micro sized SiC particles, which causes a decrease in ductility.
Review and analysis of the effect of variables on aluminium based surface composite fabricated through friction stir processing method Abdul Jabbar Ansari, Mohd Anas, S Mavhungu, E Akinlabi, M Onitiri, et al. International Journal of Advanced Technology and Engineering Exploration, 2022 High fabrication cost and constrained size are the major problems related with powder metallurgy method. Common defects arise in liquid metallurgy processing are non-uniform distribution, agglomeration, porosity and interfacial reaction. High operating temperature in thermal spraying technique and laser beam techniques make it very difficult to stop formation of obnoxious phases Friction stir processing (FSP) is an ingenious method for the fabrication of surface composite among the several other conventional methods. Basically, FSP is a solid-state surface properties modification process in which fabrication and synthesis of materials undergoes and base properties of material are reserved. By applying FSP, better structure of grains of the base material is obtained due to refinement of grain size In several metals like aluminium and magnesium, super-plasticity can be achieved by operating FSP. Several other properties like surface hardness, wear resistance and coefficient of friction can be enhanced by FSP Many researchers have investigated about the enhancement in surface properties with introduction of second phase particle materials through FSP The ability to create MMCs on the desired surface which enhanced the Review
