Supercritical Water Gasification of Wet Biomass: Modeling and Experiments

In the following decades, biomass will play an important role among the other renewable energy sources globally as it is already the fourth largest energy resource after coal, oil and natural gas. It is possible to obtain gaseous, liquid or solid biofuels from biomass via thermochemical or biochemical conversion routes. Among them, gasification...

Cooling Crystallization in an Oscillatory Flow Baffled Crystallizer (OFBC): Influence of Fluid Dynamics on Crystal Product

The Oscillatory Flow Baffled Crystallizer (OFBC) design has been proven to offer improved temperature control and near plug plow residence time distributions, while at the same time providing large residence times. These OFBC properties hold the promise of resulting in a narrow crystal size distribution, reduced residence time requirements and...

Pneumatic Manifold Design

In the high-tech industry the call for higher precision and higher accuracy will never vanish. One of the aspects that influences precision and accuracy is transportation. To transport an object contact is needed. Stigmatically thinking, contact means having a mechanical connection between the transporter and the object to transport. However, if...

Level-set Based Fluid-structure Interaction Modeling with the eXtended Finite Element Method

This study focuses on solving steady state fluid-structure interaction (FSI) problems subjected to incompressible flow at low Reynolds numbers and linear elastic structural behavior. The fluid-structure interface geometry is described with a levelset method (LSM). The governing equations are discretized in space with the eXtended Finite Element...

Acoustic coagulation of aerosols

Flue gas from combustion or syngas from gasification can contain fine particles, so called aerosols. These can be potentially harmful for downstream equipment or if emitted to the atmosphere, be inhaled by humans and cause respiratory problems. Standard practice to mitigate this is to use a cyclone which has a low filtration efficiency for sub...

Bicycle Rider Control: Observations, Modeling & Experiments

Bicycle designers traditionally develop bicycles based on experience and trial and error. Adopting modern engineering tools to model bicycle and rider dynamics and control is another method for developing bicycles. This method has the potential to evaluate the complete design space, and thereby develop well handling bicycles for specific user...

Dynamic modeling of adipic acid crystallization

A model was developed including nucleation, growth and agglomeration. The population balance was solved using a high order finite volume method.

Sustainable Air Handling by Evaporation and Adsorption

A considerable fraction of today's energy consumption is due to air-conditioning of buildings, involving both heating and cooling. Energy cost and environmental concerns force designers to find sustainable solutions. Desiccant cooling as a sustainable technology is attractive to be investigated for making different design tools. The main subject...

Modeling of Precipitation Sequence and Ageing Kinetics in Al-Mg-Si Alloys

Al-Mg-Si alloys are heat treatable alloys in which strength is obtained by precipitation hardening. Precipitates, formed from a supersaturated solid solution during ageing heat treatment, are GP-zones, B", B´ and B-Mg2Si. Precipitation kinetics and strength vary with alloy composition and process parameters. There is still a need for property...

Efficient Modeling of Rotational Effects for Wind Turbine Structural Dynamic Analysis

The history books of tomorrow will remember the start of this millennium by the global energy dilemma. The literature will portray the initial skepticism towards the first signs of global warming and the depletion of unsustainable energy sources. It will lay out how the evolution of mild symptoms into hard realities -such as the exponential...

THE EFFECT OF DYNAMIC LOAD ON FUEL CONSUMPTION AND EXHAUST EMISSIONS OF TSHD DURING DREDGING PROCESS

Model-Based Control of Industrial Batch Crystallizers: Experiments on Enhanced Controllability by Seeding Actuation

Crystallization is one of the oldest separation and purification techniques. Batch crystallizers are widely used in production of fine chemicals, food ingredients, specialty chemicals, and active pharmaceutical ingredients. Control of the crystalline material properties is a challenging task due to complexity and nonlinearity of batch...

Validation of a new adaptive deformable mirror concept

A new prototype adaptive deformable mirror for future AO-systems is presented that consists of a thin continuous membrane on which push-pull actuators impose out-of-plane displacements. Each actuator has ±10?m stroke, nanometer resolution and only mW’s heat dissipation. The mirror’s modular design makes the mechanics, electronics and control...

Evolution of morphology in solidifying aluminium alloys

In the thesis two different models of solidification of aluminum alloys are presented and analyzed. The first 1--D solidification model is derived from the conservation of solute, heat and mass. With numerical experiments it is shown that simulations with the Finite Difference discretization must adhere a relation similar to the Courant...

Inkjet printhead performance enhancement by feedforward input design based on two-port modeling

Inkjet technology is an important key-technology from an industrial point of view. Its ability to deposit various types of materials on a substrate in certain patterns makes it a very versatile technology. Though the performance criteria imposed by today's applications are quite tight already, future performance requirements will be even more...