Energy harvesters serve as continuous and long-lasting sources of energy that can be integrated into wearable implantable sensors biomedical devices. This review paper presents the current progress, challenges, advantages, disadvantages future trends which harvest from various human body. The most used types are chemical; thermal biomechanical each group is represented by several nano-generators. Chemical harvested with a help microbial enzymatic biofuel cells, collected via pyroelectric...

The human body is a source of multiple types energy, such as mechanical, thermal and biochemical, which can be scavenged through appropriate technological means. Mechanical vibrations originating from contraction expansion the radial artery represent reliable displacement to picked up exploited by harvester. continuous monitoring physiological biomarkers an essential part timely accurate diagnosis disease with subsequent medical treatment, wearable biosensors are increasingly utilized for...

This paper describes a three-dimensional design optimization procedure of vaned diffusers for centrifugal compressors, based on the coupling Genetic Algorithm (GA) and CFD code TASCflow. The aim is to find combination geometrical parameters diffuser that assures, given operating condition impeller, maximum pressure recovery with minimum amount thermodynamic losses. Physical quantities involved in fitness functions are calculated by means steady state simulations using code. multi-objective...

This paper presents a design method for blade profiles of centrifugal pump impellers based on parallel optimisation algorithm in combination with Computational Fluid Dynamics (CFD). An library (GAlib), genetic (GA), has been modified order to be able use any number processors using master/slave where the master stores population, executes GA operations, and distributes individuals slaves. The slaves only evaluate fitness at same time evaluates one as well. controls evolution population...

The paper presents a design and operation analysis of an Integrated Collector Storage (ICS) solar water heater, which consists asymmetric Compound Parabolic Concentrating (CPC) reflector trough, while the tank comprises two concentric cylinders. annulus between these vessels is partially depressurized contains small amount in bottom outer vessel dominantly contributes to heat transfer from inner cylinder. A multi-criteria optimization algorithm applied re-evaluate specifications parabolic...

The geometry of the region between impeller tip and diffuser throat is accepted as being very influential, little understood crucial to performance centrifugal compressors. This paper presents an experimental investigation flow in this where diffusing section compressor ‘pipe diffuser’ configuration. results are presented with emphasis on design-type correlations. principal features under were size influence number passages.

This paper describes a technique for the numerical modelling of axial compressors using simplest form representation—a mean-line one-dimensional method. Although this type flow analysis is gross simplification complex three-dimensional system, which can now be modelled more accurately by many today's computational fluid dynamics (CFD) packages, it does offer advantages simple input requirements and fast convergence times. These factors were major considerations when choosing prediction...

Implantable and wearable biomedical devices suffer from a limited lifespan of on-board batteries which require change causing physical discomfort. In order to overcome this, various energy harvesters have been developed as the human body possesses several types available for scavenging through appropriately designed harvesting devices, while cardiovascular system in particular represents constant reliable source mechanical vibration. Most conventional exploit only single phenomenon, such...

This paper describes the flow analysis in a centrifugal compressor stage using three-dimensional computational fluid dynamics (CFD) algorithm. The unsteadiness arising from interaction between impeller and diffuser has also been analysed an algorithm suitable for equal or multiple numbers of rotor blades. multi-block, structured grid CFD code TASCflow which provides approximate solution to Reynolds-averaged Navier-Stokes equations was used as basis development undertaken provide required...

Many researchers proposed methods for improving the efficiency of small Horizontal Axis Wind Turbines (HAWTs). One developed to increase HAWTs and overcome theoretical Betz limit is introduction a converging – diverging casing around turbine. To further improve performance diffuser flange placed at its outlet, which smoothes flow along interior, allowing larger diffusion angles be utilized. The purpose this research work aerodynamic design computational analysis such an arrangement with use...

This paper describes the steady state performance analysis of a 3-shaft closed cycle helium turbine using nuclear heat source. The is carried out computer program, which specifically made for this cycle. model was tested various Turbine Entry Temperatures (TET) and absolute pressures. change focused on compressors, as these are relatively more critical than rest equipments. in TET triggered changes shaft speed, mass flow rate, power output, pressure etc. Adjustable guide vanes were used to...

In the present paper a computational analysis of interactions between backswept impeller and its downstream vaned diffuser in high-speed centrifugal compressor is presented. Both steady unsteady simulations are carried out at peak efficiency point. Geometry scaling was used simulation order to deal with problem unequal pitch. For simulation, an averaging approach interface diffuser. A detailed comparison time averaged results performed some phenomena also discussed advance understanding flow...

Solid Particle Erosion is one of the major problems in pump industry, since operation erosive environment could cause performance alterations pumps with consequent increased maintenance and running costs, mainly due to lower efficiency. The research work aimed study erosion phenomenon vertical multistage submersible develop new coatings as means prolong their operating life through reduction rate. mechanical properties various were examined using nano-indentations, impact tests, 3D-surface...

This paper presents a computational investigation of flows in single axial flow fan with and without casing treatment. It analyses the effect recess treatment on stall margin improvement as well its influence global performance parameters. The seeks to offer contribution understanding physical processes occurring when approaching working mechanism by which treatments improve margin. A Reynolds-Averaged Navier-Stokes CFD code was used for analysis numerical overall performance, efficiency...

In urban areas, it is preferable to use small wind turbines which may be integrated a building in order supply the local grid with green energy. The main drawback of using areas that air flow affected by existence nearby buildings, conjunction variation speed, direction and turbulence adversely affect energy extraction. Moreover, efficiency turbine limited Betz limit. One methods developed increase overcome limit introduction converging – diverging shroud around turbine. Several researchers...

Wearable biosensors play a critical role in healthcare monitoring. However, the reliance of on batteries has serious drawbacks. Although human body's energy can be converted into electricity with harvesters, hybridisation multiple harvesters is prominent way increasing power output. In this work, hybrid piezoelectric and reverse electrowetting (REWOD) harvester proposed. Its main working principle based presence an electrical double layer REWOD component coupling nanogenerator via electret....