M. Hackert-Oschätzchen, R. Paul, M. Penzel, M. Zinecker, A. Schubert
Professorship Micromanufacturing Technology, Technische Universität Chemnitz, Chemnitz, Germany
Evaporative cooling is a promising cooling method for dissipating high heat fluxes in high power density applications. One possibility to enhance heat flux is a generation of microstructures into the cooler surface. This enlarges the cooler surface and systematically affects the fluid flow as well as the boiling process. In this study the geometric arrangement of cylindrical pin microstructures ...
Siemens Technology and Services Private Limited, Bengaluru, Karnataka, India
Introduction: Solver section of FEA plays a very important role; it takes the input from the preprocessor and solves millions of equations using numerical methods. Capability of any analysis tools can be measured based on the solver. Understanding the nature and operation of various structural solid mechanics solvers is the interest of the present study. Results: Contact pressure is ...
K. O. Lund , S. M. Lord ,
 Kurt Lund Consulting (COMSOL Certified Consultant), Del Mar, CA, USA
 SML Associates, Encinitas, CA, USA
A frequently occurring geometry for heat exchangers is that of a long tube wound into a helix or spiral around a core volume. There is to be heat exchange between the tube and the gases (or solids) in the core. However, the length scales of these two parts of the geometry are very different, thus complicating the interface between the tube and the core processes. Usually, the tube is too ...
Using COMSOL Multiphysics to Model Crust Development at the Surface of Whole Beef Meat Subjected to Hot Air Jet
J. Sicard , S. Portanguen , C. Chevarin , A. Kondjoyan 
 INRA Auvergne-Rhône-Alpes, Saint-Genès-Champanelle, FRANCE
Crust which develops at the surface of meat leads to reactions which affect food color, flavor and safety. Whole pieces of meat are only contaminated by microorganisms at their surface. Thus intense thermal treatment can inactivate pathogenic bacteria; however the associated high temperatures also lead to the formation of carcinogenic compounds. An experimental study of crust development at ...
A. Priarone, S. Lazzari, and E. Zanchini
Dipartimento di Ingegneria Energetica, Nucleare e del Controllo Ambientale, Alma Mater Studiorum - Università di Bologna, Bologna, Italy
The long-term performance of double U-tube Borehole Heat Exchangers (BHEs) is studied numerically by considering three different time-dependent heat fluxes exchanged between each BHE and the ground. Since the temperature distribution along the vertical direction has a negligible influence on long-term BHE performance, the problem is studied by means of a 2D conduction model, where the energy ...
OSRAM SYLVANIA, Beverly, MA, USA
COMSOL Multiphysics is used to simulate natural convection and its impact on peak operating temperatures of solid-sate lighting in thermally adverse conditions. PDE modes in the general form are used in conjunction with a thin-surface conduction formulation in the weak form. COMSOL is used to predict both temperatures and heat flows through numerous components of the configuration. Model ...
Thermal Performance of a Deviated Deep Borehole Heat Exchanger: Insights from a Synthetic Heat and Flow Model
M. Le Lous , F. Larroque , A. Dupuy , A. Moignard 
 ENSEGID, Bordeaux, France
 Fonroche Géothermie, Pau, France
Earth heat exchangers are drawing increasing attention and popularity due to their efficiency, sustainability and universality. In addition, DBHE can offer higher temperatures and more return on investment than conventional system. DBHE is also an alternative to geothermal power generation or to direct use applications in an extreme engineered (or enhanced) geothermal systems (EGS). However, the ...
Numerical Modeling of the Near-Subsurface Temperature Distributions in the Presence of Time Varying Air Temperature in the Boundary Condition and Space Varying Temperature for the Initial Condition - new
M. Ravi, D. V. Ramana, R. N. Singh
CSIR - National Geophysical Research Institute, Hyderabad, Telangana, India
The subsurface thermal structure in presence of groundwater recharge/discharge has been obtained by applying the Robin type boundary condition at the earth’s surface. The Robin type boundary condition involves the effect air temperatures at the surface which are taken as exponentially varying with time and the initial condition which is taken as exponential function of depth. The numerical ...
S. Fujii, Y. Wada
Chiba University, Chiba, Japan
Tokyo Institute of Technology, Tokyo, Japan
Chemical reactions conducted under microwave irradiation have high reaction rates and high selectivity, but these reaction rates are not always reproducible. To achieve reproducibility, a solid-state microwave source with an ultra precise oscillator, high power amplifier module (HPA), and elliptical applicator is developed. This HPA has up to 141 W average power and generates pure 2.45-GHz sine ...
N. H. Elabbasi, M. J. Hancock, S. B. Brown
Veryst Engineering, LLC., Needham, MA, USA
Wear is a complex phenomenon relevant to many problems involving frictional contact, such as mechanical brakes, seals, metal forming, and orthopedic implants. The rate of wear depends on the properties of the contacting materials and operating conditions. One widely used model of wear is Archard’s law, which relates the rate of material removal due to wear to the contact pressure, sliding ...