scholarly journals GASTRONOMY UNIVERSE BY EYES OF PHYSICISTS

2020 ◽  
Author(s):  
Andrey Varlamov ◽  
Attilio Rigamonti
Keyword(s):  
Heat Conduction ◽  
Dimensional Analysis ◽  
Thermal Diffusion ◽  
Cooking Time ◽  
Diffusion Equations ◽  
Meat Cooking

After a brief presentation of the general scenario to which the note is connected, the equations involved in some processes related to gastronomy and cuisine activity are derived, only by resorting to dimensional analysis. It is shown how the meat cooking time, or that one for spaghetti preparation can be quantitatively calculated on the basis of the heat conduction or thermal diffusion equations. The processes involved in baking of a good pizza (particularly in a wood oven!) or brewing a good coffee are addressed on the basis of scientific approaches.

scholarly journals On the solution of reaction-diffusion equations with double diffusivity

1987 ◽  
Vol 10 (1) ◽  
pp. 163-172
Author(s):  
B. D. Aggarwala ◽  
C. Nasim
Keyword(s):  
Heat Conduction ◽  
Partial Differential Equations ◽  
Differential Equations ◽  
Reaction Diffusion ◽  
Reaction Diffusion Equations ◽  
Diffusion Equations ◽  
Partial Differential ◽  
Coupled Partial Differential Equations ◽  
Special Cases ◽  
Two Temperatures

In this paper, solution of a pair of Coupled Partial Differential equations is derived. These equations arise in the solution of problems of flow of homogeneous liquids in fissured rocks and heat conduction involving two temperatures. These equations have been considered by Hill and Aifantis, but the technique we use appears to be simpler and more direct, and some new results are derived. Also, discussion about the propagation of initial discontinuities is given and illustrated with graphs of some special cases.

On Fire-Proof Paint Thickness for Steel under Transient Fire

2014 ◽  
Vol 1065-1069 ◽  
pp. 1916-1920
Author(s):  
Wen Zhong Wu
Keyword(s):  
Heat Conduction ◽  
Surface Temperature ◽  
Dimensional Analysis ◽  
Fire Safety ◽  
Heat Conduction Equation ◽  
Steel Structure ◽  
Key Factor ◽  
The Common ◽  
Paint Thickness ◽  
In Fire

Fire-proof paint thickness is of importance to steel structure fire safety, and the common programme iteratively solves its heat conduction equation in fire-insistence test, while by dimensional analysis in the equation, this paper constructs a function of steel structure section-material grouped parameter, and also a similarity form is employed to form a relationship between any two different transient fires, then solves the grouped parameters in two other transient fires. Parameter comparisons among these 3 fires conclude: with the same fire time, fire-proof paint and size, fire-proof paint thickness is necessary to be the biggest in fire-insistence test, and smaller in site fire, and the smallest in t-square fire. The key factor to decide the thickness is surface temperature outside fire-paint. The common programme is with some redundance, and more reasonable guard should add to the steel structure in t-square fire. The foregoing analysis to fire-proof paint thickness by the function of steel structure section-material grouped parameter and the similarity form between any two different transient fires, broadens the common programme to any transient fires.

Calculation of transient supersaturation in the thermal diffusion cloud chamber at measurements of supersaturation spectrum of cloud condensation nuclei

1982 ◽  
Vol 47 (1) ◽  
pp. 217-225 ◽  
Author(s):  
Jiří Smolík ◽  
Jaroslav Vítovec
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Energy Balance ◽  
Thermal Diffusion ◽  
Analytical Solutions ◽  
Cloud Condensation Nuclei ◽  
Arithmetic Mean ◽  
Cloud Chamber ◽  
Condensation Nuclei ◽  
Mass And Heat Transfer

On the basis of numerical solution of material and energy balance including, beside diffusion and heat conduction, also the convective components of mass and heat transfer and interconversion of mechanical and thermal energies, the problem is analysed of transient supersaturation in the thermal diffusion cloud chamber at measurements of supersaturation spectra of cloud condensation nuclei (CCN). The results are compared with analytical solutions of the same problem for the case when diffusion and heat conduction are considered as the only mechanism of mass and heat transfer. The most advantageous case for measurement of supersaturation spectra CCN as results from the analysis, is that one when the temperature of the sample is equal to the arithmetic mean of temperatures of both plates of the chamber.

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