Free Engineering Simulation Tutorial - Opensource Software & Simulation Guides

A glowing furnace, the warmth of the sun, a red-hot element — all reach you through thermal radiation, no contact or air required. Unlike conduction and convection, radiation needs no medium and grows explosively with temperature: it scales with the fourth power of absolute temperature. The Stefan-Boltzmann law captures this, and this free Stefan-Boltzmann Radiation Calculator computes the radiative heat transfer from a surface to its surroundings (or between two surfaces), plus blackbody emissive power, from temperature, emissivity and area. Figure 1 Stefan-Boltzmann Eq Calculator Table of Contents The Radiation Calculator The Stefan-Boltzmann Law Emissivity Explained The Fourth-Power Effect Surface-to-Surface Exchange Radiation vs Convection Worked Example Common Mistakes FAQ The Stefan-Boltzmann Radiation Calculator Choose the case, enter temperatures (°C), emissivity and area, and get the net radiative heat...

Add a fin to a hot surface and you give heat more room to escape. That's the whole idea behind extended surfaces — the fins on an engine, a heat sink, or a radiator tube. But a fin isn't a free lunch: because heat has to conduct along it, the tip runs cooler than the base and does less work. This free Fin Heat Transfer Rate Calculator computes the actual heat dissipated (Q) by a rectangular or pin fin, plus its efficiency and effectiveness , from geometry, conductivity, convection and temperatures. Figure 1 Fin Heat Trasnfer Calculator Table of Contents The Fin Heat Transfer Calculator What Is a Fin? The Fin Equations Efficiency vs Effectiveness Design Guidelines Worked Example Common Mistakes FAQ The Fin Heat Transfer Rate Calculator Pick a fin type, enter its geometry, material conductivity, the convection coefficient and the base/fluid temperatures. Get the per-fin heat rate, efficiency and effectiveness (ad...

Why does a metal spoon heat up almost instantly in hot soup while a wooden one stays cool? The answer isn't just conductivity — it's thermal diffusivity , the property that decides how fast a material responds to a temperature change. It bundles conductivity, density and specific heat into a single number that governs all transient (time-dependent) heat conduction. This free Thermal Diffusivity Calculator computes α = k/(ρc p ) instantly — or back-solves any one of the three properties — with a handy materials reference table. Figure 1 Thermal Diffusivity Calculator Table of Contents The Thermal Diffusivity Calculator What Is Thermal Diffusivity? The Formula Diffusivity vs Conductivity Role in Transient Conduction Typical Values Worked Example Common Mistakes FAQ The Thermal Diffusivity Calculator Enter thermal conductivity, density and specific heat to get α — or pick a different unknown to back-solve. Load ...