Thermal Characteristics and State Diagram of Freeze-Dried Broccoli: Freezing Curve, Maximal-Freeze-Concentration Condition, Glass line and Solids-Melting

  • Sithara Suresh
  • Nasser Al-Habsi
  • Nejib Guizani
  • Mohammad Shafiur Rahman

Abstract

In this study, the state diagram of broccoli was developed considering freezing curve, glass line, maximal-freeze concentration conditions, solids-melting and BET-monolayer line. The freezing point, glass transition and solids-melting were measured and modeled by Chen’s model, Gordon-Taylor model, and Flory-Huggins model, respectively. The ultimate maximal-freeze-concentration conditions (Tm)u (i.e. end temperature of freezing) and (Tg)u [i.e. end glass transition at (Tm)u] were found as -30.0oC and -32.2oC, respectively, and solids content (i.e. Xs) at this point was 0.70 g/g sample. The solids-water interaction () during melting was estimated as 0.69 (dimensionless) from Flory-Huggins model, and BET-monolayer was observed as 0.089 g/g dry-solids at 20oC.

Published
2017-03-15
How to Cite
SURESH, Sithara et al. Thermal Characteristics and State Diagram of Freeze-Dried Broccoli: Freezing Curve, Maximal-Freeze-Concentration Condition, Glass line and Solids-Melting. ICTEA: International Conference on Thermal Engineering, [S.l.], v. 2017, mar. 2017. Available at: <http://journals.library.ryerson.ca/ictea/article/view/29>. Date accessed: 20 feb. 2018.
Section
Articles