Development and Validation of a First Principles Fluid-Thermal Multi-Physics Solver for Hypersonic Boundary Layer Heat Transfer Problems

2011 ◽  
Author(s):  
Chrisopher Ostoich ◽  
Daniel Bodony ◽  
Philippe Geubelle
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
First Principles ◽  
Hypersonic Boundary Layer ◽  
Development And Validation ◽  
Transfer Problems

Utilizing the Integral Technique to Determine the Similarity Variable in Classical Heat Transfer Problems: One Dimensional Heat Conduction in a Finite or Semi-Infinite Solid

2013 ◽  
Author(s):  
Chris J. Kobus
Keyword(s):  
Heat Transfer ◽  
Differential Equation ◽  
Boundary Layer ◽  
Variable Temperature ◽  
Boundary Layer Theory ◽  
Good Tool ◽  
Similarity Variable ◽  
Integral Technique ◽  
Independent Variable ◽  
Transfer Problems

In advanced heat transfer courses, a technique exists for reducing a partial differential equation where the dependent variable is a function of two independent variables, to an ordinary differential equation where that same dependent variable becomes a function of only one independent variable. The key to this technique is finding out what the similarity variable to make this transformation is. The difficulty is that the form of the similarity variable is not intuitive, and many heat transfer textbooks do not reveal how this variable is found in classical problems such as viscous and thermal boundary layer theory. It turns out that one way to find this variable is by utilizing the integral technique. By employing the integral technique to boundary layer theory, it will be shown that when the approximate functional relationship for the dependent variable (temperature, velocity, etc) can be represented by an nth order polynomial, the similarity variable can be found very simply. This is seen to be a good tool especially in heat transfer education, but has applications in research as well.

Utilizing the Integral Technique to Determine the Similarity Variable in Classical Heat Transfer Problems: Thermal Boundary Layer Theory

2018 ◽  
Author(s):  
Chris J. Kobus
Keyword(s):  
Heat Transfer ◽  
Differential Equation ◽  
Boundary Layer ◽  
Thermal Boundary Layer ◽  
Variable Temperature ◽  
Boundary Layer Theory ◽  
Good Tool ◽  
Similarity Variable ◽  
Integral Technique ◽  
Transfer Problems

In advanced heat transfer courses, a technique exists for reducing a partial differential equation, where the dependent variable is a function of two independent variables, to an ordinary differential equation where that same dependent variable becomes a function of only one. The key to this technique is finding out what the functional form of the similarity variable is to make such a transformation. The difficulty is that the form of the similarity variable is not intuitive, and many heat transfer textbooks do not reveal how this variable is found in classical problems such as viscous and thermal boundary layer theory. It turns out that one way to find this variable is by utilizing the integral technique. By employing the integral technique to boundary layer theory, it will be shown that when the approximate functional relationship for the dependent variable (temperature, velocity, etc) can be represented by an nth order polynomial, the similarity variable can be found very simply. This is seen to be a good tool especially in heat transfer education, but may have applications in research as well. The approach described here is a variation of a well-known technique used for isothermal momentum boundary layer consideration.

Roughness-induced turbulent wedges in a hypersonic blunt-body boundary layer

2014 ◽  
Vol 754 ◽  
pp. 208-231 ◽  
Author(s):  
A. Fiala ◽  
R. Hillier ◽  
D. Estruch-Samper
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Laminar Flow ◽  
Boundary Layer Thickness ◽  
Blunt Body ◽  
Roughness Element ◽  
Surface Heat ◽  
Hypersonic Boundary Layer ◽  
Element Size ◽  
Body Boundary

AbstractThis paper uses measurements of surface heat transfer to study roughness-induced turbulent wedges in a hypersonic boundary layer on a blunt cylinder. A family of wedges was produced by changing the height of an isolated roughness element, providing conditions in the following range: fully effective tripping, for the largest element, with a turbulent wedge forming immediately downstream of the element; a long wake, in length several hundred times the boundary layer thickness, leading ultimately to transition; and retention of laminar flow, for the smallest element. With appropriate element size, a fully intermittent wedge formed, comprising a clear train of turbulent spots.

scholarly journals Heat transfer investigation in an hypersonic boundary layer

2010 ◽  
Author(s):  
P. Schreivogel ◽  
G. Paniagua ◽  
H. Bottini ◽  
D. Masutti ◽  
O. Chazot ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Hypersonic Boundary Layer
Sign in / Sign up

Export Citation Format

Share Document