Colin Reagle

 ColinJ. Reagle

Colin J. Reagle

  • Courses2
  • Reviews13
Nov 4, 2019
N/A
Textbook used: Yes
Would take again: No
For Credit: Yes

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0






Difficulty
Clarity
Helpfulness

Awful

I couldn't believe that some students got an F in this class. It is totally their fault if they did. He actually gives 70% weighted for test. Thus, it makes no chance for students to recover their grades. For all 35 students, this is very frustrating.

Oct 14, 2019
N/A
Textbook used: Yes
Would take again: No
For Credit: Yes

0
1






Difficulty
Clarity
Helpfulness

Awful

Nice and smart, but a very harsh grader.

Oct 14, 2019
N/A
Textbook used: Yes
Would take again: No
For Credit: Yes

0
1


Mandatory



Difficulty
Clarity
Helpfulness

Awful

Choosing Professor Reagle was a huge mistake. His grading system is super difficult, making it a task to get even a C or a D.

Oct 12, 2019
N/A
Textbook used: Yes
Would take again: No
For Credit: Yes

0
1


Mandatory



Difficulty
Clarity
Helpfulness

Poor

Easily the toughest grader I've ever had. The test is weighted for 70%, the whole class got an F on the midterm. Getting a C in the class is hard.

Dec 26, 2019
N/A
Textbook used: Yes
Would take again: Yes
For Credit: Yes

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0


Not Mandatory



Difficulty
Clarity
Helpfulness

Awesome

Truly one of the top notch professors you can take in the Mechanical Engineering Department. Professor Reagle's tests are difficult because he wants to push you, if you complete all the practice problems he gives you, and know the material inside and out then you will do very good. Although his test are complex, he wants to assist you, so go to his office.

Biography

George Mason University - Engineering


Resume

  • 2009

    Doctor of Philosophy (Ph.D.)

    Effects of sand and dust ingestion on turbomachinery. Development of a hybrid particle tracking velocimetry and computational fluid dynamics measurement technique. Experimental analysis of sand impacts on turbomachinery materials at high temperatures.

    Mechanical Engineering

    Virginia Tech

  • 2007

    Master's of Science (M.S.)

    Experimental heat transfer

    thin film gage and infrared temperature measurements on turbine airfoils.

    Mechanical Engineering

    Virginia Tech

  • 2003

    Bachelor's degree

    Mechanical Engineering

    VT Soccer Club

    Hybrid Electrical Vehicle Team

    American Society of Mechanical Engineers

    Virginia Tech

  • Microsoft Office

    Algorithms

    Labview

    Materials Science

    CFD

    R&D

    Thermodynamics

    Image Processing

    Fortran

    Heat Transfer

    Physics

    Mathematical Modeling

    Matlab

    Mechanical Engineering

    Numerical Analysis

    Linux

    Signal Processing

    Research

    CFX

    C++

    An Experimental Investigation of Showerhead Film Cooling Performance in a Transonic Vane Cascade at Low and High Freestream Turbulence

    Hee-Koo Moon

    Wing Ng

    Shakeel Nasir

    An Experimental Investigation of Showerhead Film Cooling Performance in a Transonic Vane Cascade at Low and High Freestream Turbulence

    Luzeng Zhang

    Hee-Koo Moon

    Wing Ng

    Andrew Newman

    This paper describes a method for obtaining surface and endwall heat transfer in an uncooled transonic cascade facility using infrared thermography measurements. Midspan heat transfer coefficient results are first presented for an engine representative first stage nozzle guide vane at exit Mach number of 0.77

    Reynolds number of 1.05×106 and freestream turbulence intensity of 16%. The results obtained from infrared thermography are compared with previously published results using thin film gauges in the same facility on the same geometry. There is generally good agreement between the two measurement techniques in both trend and overall level of heat transfer coefficient over the vane surface. Stanton number contours are then presented for a blade endwall at exit Mach number of 0.88

    Reynolds number of 1.70×106 and freestream turbulence intensity of 8%. Infrared thermography results are qualitatively compared with results from a published work obtained with liquid crystals at similar flow conditions. Results are qualitatively in agreement.

    A Transient Infrared Technique for Measuring Surface Heat Transfer In A Transonic Turbine Cascade

    Wing Ng

    Jacob Delimont

    Large amounts of tiny microparticles are ingested into gas turbines over their operating life

    resulting in unexpected wear and tear. Knowledge of such microparticle behavior at gas turbine operating temperatures is limited in published literature. In this study

    Arizona road dust (ARD) is injected into a hot flow field to measure the effects of high temperature and velocity on particle rebound from a polished 304 stainless steel (SS) coupon. The results are compared with baseline (27 m/s) measurements at ambient (300 K) temperature made in the Virginia Tech Aerothermal Rig

    as well as previously published literature. Mean coefficient of restitution (COR) was shown to decrease with the increased temperature/velocity conditions in the VT Aerothermal Rig. The effects of increasing temperature and velocity led to a 12% average reduction in COR at 533 K (47 m/s)

    15% average reduction in COR at 866 K (77 m/s)

    and 16% average reduction in COR at 1073 K (102 m/s) compared with ambient results. The decrease in COR appeared to be almost entirely a result of increased velocity that resulted from heating the flow. Trends show that temperature plays a minor role in energy transfer between particle and impact surface below a critical temperature.

    Study of Microparticle Rebound Characteristics Under High Temperature Conditions

    Wing Ng

    A novel particle tracking velocimetry (PTV)/computational fluid dynamics (CFD) hybrid method for measuring coefficient of restitution (COR) has been developed which is relatively simple

    cost-effective

    and robust. A laser and camera system is used in the Virginia Tech Aerothermal Rig to measure velocity trajectories of microparticles. The method solves for particle impact velocity at the impact surface using a CFD solution and Lagrangian particle tracking. The methodology presented here attempts to characterize a difficult problem by a combination of established techniques

    PTV and CFD

    which have not been used in this capacity before. Erosion and deposition are functions of particle/wall interactions and COR is a fundamental property of these interactions. COR depends on impact velocity

    angle of impact

    temperature

    particle composition

    and wall material. Two sizes of Arizona road dust and one size of glass beads are impacted on to a 304 stainless steel coupon. The particles are entrained into a free jet of 27 m s−1 at room temperature. Impact angle was varied from 85° to 25° depending on particle. Mean results collected using this new technique compare favorably with trends established in literature. The utilization of this technique to measure COR of microparticle sand will help develop a computational model and serve as a baseline for further measurements at elevated air and wall temperatures.

    Measuring the coefficient of restitution of high speed microparticle impacts using a PTV and CFD hybrid technique

    Wing Ng

    Danesh Tafti

    Sukhjinder Singh

    ASME HT2012-58100

    A two pass stationary square duct with rib turbulators subjected to sand ingestion is studied using Large Eddy Simulations (LES). Each pass has ribs on two opposite walls and aligned normal to the main flow direction. The rib pitch to rib height (P/e) is 9.28

    the rib height to channel hydraulic diameter (e/Dh) is 0.0625 and calculations have been carried out for a bulk Reynolds number of 25

    000. Particle sizes in the range 0.5–25 μm are considered

    with the same size distribution as found in Arizona Road Dust (medium). Large Eddy Simulation (LES) with wall-model is used to model the flow and sand particles are modeled using a discrete Lagrangian framework. 220

    000 particles are injected at the inlet and perfectly elastic collisions with the wall are considered. Results quantify the distribution of particle impingement density on all surfaces. Highest particle impingement density is found in the first quarter section of the second pass after the 180° turn

    where the recorded impingement is more than twice that of any other region. It is also found that the average particle impingement per pitch is 28% higher in the second pass than the first pass. Results show lower particle tendency to hit the region immediately behind the rib in the first pass compared to the second pass where particle impingement is more uniform in the region between two ribs. The smooth walls do not show much particle impingement except the wall in second pass where the flow impinges after the turn. The rib face facing the flow is by far is the most susceptible to impingement and hence deposition and erosion. The results of this simulation were also compared with results obtained from experiments conducted on an identical two pass geometry with Arizona Road Dust particles. The particle impingement pattern is recorded by using a sticky tape on all surfaces to capture the particles. The numerical predictions showed good qualitative agreement with experimental measurements.

    Sand Transport in a Two Pass Internal Cooling Duct with Rib Turbulators

    Reagle

    Caterpillar Inc.

    TECHNOLOGY IN BLACKSBURG

    Virginia Tech

    George Mason University - Volgenau School of Engineering

    Honeywell Aerospace

    Alstom Power

    TECHNOLOGY IN BLACKSBURG

    Birr

    Aargau

    Switzerland

    Praktikant

    Alstom Power

    Phoenix

    AZ

    Intern

    Honeywell Aerospace

    Fairfax

    Virginia

    Assistant Professor

    George Mason University - Volgenau School of Engineering

    Christiansburg

    VA

    Principal Research Engineer

    TECHNOLOGY IN BLACKSBURG

    Christiansburg

    VA

    Research Engineer

    TECHNOLOGY IN BLACKSBURG

    Virginia Tech

    Virginia Tech

    Blacksburg

    VA

    Thermodynamics

    Instructor

    George Mason University - Volgenau School of Engineering

    Caterpillar Inc.

    Intern

    Peoria

    Illinois Area

    American Society of Engineering Education

    Member

    American Society for Mechanical Engineers

    George Mason University

    Fenwick Fellow

    The role of renewables in George Mason University’s future energy portfolio

    George Mason University

    Outstanding Achievement Award

    George Mason University

    ASME Best Paper

    Reagle

    C.J.

    Delimont

    J.M.

    Ng

    W.F.

    and Ekkad

    S.V.

    2013 “Study of Microparticle Rebound Characteristics Under High Temperature Conditions”

    Coal

    Biomass

    and Alternative Fuels Committee

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