Particle Image Velocimetry and Planar Laser Induced Florescence are non intrusive methods for quantitative measurements of fluid flow. In PIV, movement of tracer particles being carried by a fluid is used as a means to calculate velocity vectors. Another similar method incorporates different types of dye to give a measurement of scalar variables using almost the same equipment. This method is called PLIF and can be used to measure different fluid phases, varying temperature, or different species in reaction. Both methods use laser optics and image processing. We are working with Nd:YAG laser for PIV and passive scalar PLIF, and dye laser for temperature PLIF along with reactive PLIF. Different kinds of fluorescent dyes are incorporated for each method.
Prof. Olsen has worked with founders of these methods and throughout past years, his research group have developed the knowledge and expertise to carry out a broad range of experiments.
Fluidized bed reactors have application in catalytic reactions for different types of plants in different petroleum and biologic industries. We are trying to use simultaneous PIV/PlIF to quantitatively measure flow and temperature fields in such a reactor. Our test involves liquid-solid two phase flow. Reaching inside the pores of a fluidized bes for extracting data has been impractical yet. We will use the technique of matching index of refraction of fluid and particles in order to collect data from inside the pores.
In production of nano particles, certain conditions need to be maintained for a reaction in order to keep the products within the required size. This would generally be achieved by a relatively fast mixing of reactants and swift purge of product to prevent agglomeration for the most part. Our research group has already done different experiment with a micro MIVM in the past. In a pursuit of scaling up the facilities for larger amount of production, we are extending our knowledge by developing a macro MIVM using the same concepts. We will investigate fluid flow and reaction using SPIV and Reactive PLIF in this reactor.
Flow of a fluid between rotating cylinders is a well known concept in fluid mechanics. This type of reactor is being used in algae growth application in our labs in which a second phase fluid is injected from the bottom of the reactor. We are setting out to gather precise data of bubble shape and transport in such a flow regime. The idea is to use to immiscible fluids with the same index of refraction inside a reactor so that we can prevent distortion of laser sheet and image due to the bubble shape. a fluorescence dye in the bubbling phase would enable us to use PLIF for distinguishing the two phases.
Simulation of a Diesel engine combustion merely is a matter of simulating fuel sprays in the cylinder. As the MSc final project I developed a multi-zone spray simulation which is used for 1-D numerical engine model. Such models are used for overall engine performance investigations. Later, my PhD adviser, Ali Salavatizadeh, incorporated a soot formation model in that code.
Free and Forced Convection Heat Transfer
My BSc project was in collaboration with Mohammad Mazaheri who is one my best friends. Most of the credit of it goes to him, but our project turned to be chosen as the best in Iranian Society for Mechanical Engineers (ISME). We experimentally investigated convection Heat transfer of air in eccentric annulus.
I am not necessarily a fan of numerical simulation, but I have a knowledge of CFD through being involved in different research projects.