手法を比較

	フィックの法則	ブシネスク近似	乾湿空気線図分析
分野	熱力学	熱力学	熱力学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1855	1903	1911
提唱者	Adolf Fick	Joseph Boussinesq	R. E. Carrier
種類	Diffusion law	Approximation technique	Humid air thermodynamic analysis
原典	Fick, A. (1855). On liquid diffusion. Philosophical Magazine, 10(63), 30-39.	Boussinesq, J. (1903). Théorie Analytique de la Chaleur. Gauthier-Villars.	ASHRAE. (2021). Handbook-Fundamentals. American Society of Heating, Refrigerating and Air-Conditioning Engineers.
別名	diffusion equation, Fickian diffusion	buoyancy approximation, Boussinesq model	psychrometrics, humid air analysis
関連	3	3	3
概要	Fick's Laws describe how species diffuse through media due to concentration gradients. The First Law (steady-state) relates diffusion flux to concentration gradient, while the Second Law (transient) describes how concentration changes over time. These laws are fundamental to mass transfer analysis, applying to gases, liquids, and solids. Fick's Laws are analogous to Fourier's Law of heat conduction, replacing temperature with concentration.	The Boussinesq Approximation simplifies the governing equations for natural convection by treating density as constant except in the buoyancy term. This approximation is valid when temperature variations produce small density changes and allows researchers to solve coupled heat-fluid flow problems without solving the full, nonlinear compressibility equations. The Boussinesq Approximation is fundamental to analyzing buoyancy-driven flows in buildings, enclosures, and geophysical applications.	Psychrometric analysis is the study of humid air (air-water vapor mixtures) and its properties. It is essential for designing and analyzing air conditioning, ventilation, and dehumidification systems. Psychrometric analysis relates dry-bulb temperature, wet-bulb temperature, dew point, relative humidity, and specific humidity through carefully constructed charts and correlations.