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As thermography professionals, we must be well grounded in the basics of heat transfer. If not, we’ll make mistakes in understanding, interpreting, and presenting our data. If you don’t feel 100% confident in your understanding, I urge you to move in that direction and will offer these posts as simple starting points. Convection happens in [...] Last week, we talked about that mug of coffee and transient heat flow. The temperature of many surfaces is constantly changing because of an imbalance in the transfer of energy with the surroundings. When things balance, reaching what we call steady-state transfer, then temperatures stabilize. We have all heard about the three modes of heat transfer: [...] Last week we talked about that mug of coffee and the notion of thermal capacitance. Thermal persistence is another way to think of this concept. To one degree or another things are slow to change temperature. This is due to both the way heat is transferred (convection is rapid while conduction tends to be slower)and the [...] We’ve turned the calendar to a new month and year—Happy New Year readers! We’ve also turned the corner of the Winter Solstice, at least here in the Northern Hemisphere, and are headed to longer days. We may be getting more daylight, but it will be about six more weeks until the average temperature begins to increase. [...] |
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