Methodology to Calculate Boundary Conditions in a Single Isolated Helically Segmented Finned Tube Module

Numerical simulation of turbulent air flow on a single isolated finned tube module with periodic boundary conditions

International Journal of Thermal Sciences ◽

10.1016/j.ijthermalsci.2015.01.024 ◽

2015 ◽

Vol 92 ◽

pp. 58-71 ◽

Cited By ~ 14

Author(s):

E. Martinez ◽

W. Vicente ◽

M. Salinas-Vazquez ◽

I. Carvajal ◽

M. Alvarez

Keyword(s):

Numerical Simulation ◽

Boundary Conditions ◽

Periodic Boundary ◽

Air Flow ◽

Periodic Boundary Conditions ◽

Finned Tube ◽

Turbulent Air Flow

Download Full-text

Mathematical Modeling of a Long Finned Tube Heating and Cooling in a Multizone Furnace

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4040278 ◽

2018 ◽

Vol 10 (5) ◽

Author(s):

Chao Liang ◽

Darshil R. Patel ◽

Maulik R. Shelat

Keyword(s):

Heat Transfer ◽

Boundary Conditions ◽

Heat Transfer Performance ◽

Finned Tube ◽

Transfer Model ◽

Scale Production ◽

Metal Substrates ◽

Heating And Cooling ◽

Proposed Model ◽

Industrial Scale Production

To support an effort to setup an industrial scale production facility to produce metal substrates coated with porous boiling surface (PBS) coating to enhance boiling heat transfer performance of these metal substrates, an axisymmetric transient heat transfer model with boundary conditions varying both in time and length dimensions has been proposed and solved to obtain the temperature evolution along the inner surface of a long finned tube heating and cooling in a multizone furnace. Experiments for finned tube heating and cooling were conducted using a single-zone batch furnace, and the experimental data obtained were compared with the simulation results to establish reasonable confidence in the proposed model and boundary conditions. A parametric study on several important operating parameters was conducted to gain better insights that can be used in making design and operating decisions. If required, the model can conveniently be extended to other types of substrates and furnace dimensions.

Download Full-text

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100068795 ◽

1970 ◽

Vol 28 ◽

pp. 360-361

Author(s):

John W. Coleman

Keyword(s):

Boundary Conditions ◽

High Performance ◽

Force Fields ◽

Optical Design ◽

Direct Conversion ◽

Design Engineering ◽

Design Data ◽

Scalar Potentials ◽

Geometric Elements ◽

At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

Download Full-text