The activation energy for foam dried product is high (33kJ/mol) than unfoamed product (16kJ/mol). higher activation energy implies higher moisture diffusivity.
the energy required to start the drying process is higher is case of foamed product due to the presence of air bubbles. is it so??
kindly explain the reason for the same.
Diffusivity will be critical, because we have drying surfaces differences, Energy of activation can be at range between 16 and 110 kJ/mol without foam mat process, changing velocity of air too. So yes, bubbles of air contribute to differences, and they are a limitation to the velocity of drying air possible to use. As higher the activation energy, higher the diffusivity, and this is in agreement to models.
Activation energy means minimum required energy for removal of one mole of moisture content. Yes, higher activation energy means, more energy required for removal of moisture content. By the way, to my understanding higher activation energy means poor thermal diffusivity of foam mat. It may inteprete like this, if it is more activation energy, it requires more energy to improve the diffusivity.
Yes Dr. Asok Mithra, u r results are correct, As , foamed mate having air pockets, it implicates poor thermal diffusivity. So, more energy is required to remove the moisture content.
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