The new SousVide Dash version 2.0 is a significant contribution to the science of sous vide cooking. Now you can calculate the time necessary to reach the desired temperature irrespective of pasteurization, OR the time required to pasteurize the surface (assuming the interior of the meat is still sterile), OR the time required to pasteurize all the way to the core, e.g, for hamburgers, etc.
Curves are plotted showing the surface temperature, core temperature, and the log reduction of various pathogens (E. Coli, Listeria, and Salmonella, depending on the kind of food) vs. time.
Suggested temperatures are provided for various meats, including beef, chicken (white and dark), duck, pork, lamb, eggs (fast and slow), lean and fatty fish, scallops, shrimp, clams, oysters, and mussels. No turkey, and no vegetables (yet). It would be nice if users could add their own favorite foods and default temperatures.
A number of different sous vide water baths are included, so that you dont have to make all of the complicated thermal diffusivity calculations (or guess).
Ive encouraged the author to add another feature (or another app) to calculate chilling times for sous vide cook/chill, both in an ice bath and with a chilled alcohol bath. It will probably need to be a separate app, because of the fact that the ice bath is not generally stirred.
The one thing that is still sorely lacking is the ability to compute the time from a frozen state, but because of the latent heat required to change ice into water, or more exactly, frozen meat into thawed meat, this is MUCH more complex. I may have to discipline myself to thaw a steak or whatever in the refrigerator a day ahead of time, in order to avoid this problem.