1. Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
2. Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia 24061, United States
3. Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
4. Department of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States