In previous papers 1, 2), we have studied the coking-rate equations considering only the soaking phenomenon of rice and noodles and so on. In this paper, we studied the soaking and dissolution-rate equations on the cooking of foods.
The rate equations of spaghetti and hiyamugi (cooking temperature 70~99.5℃) have been postulated as follow.
dw_AR /dθ = k₁^* (w_e-w_o)/w_o² )w_A²- k₃^* w_A
dw_STD /dθ= k₃ ^* (w_d /w_o)/w_A
where, w_A = w_o (w_e - w_AR - (w_e /w_R )W_STD ) /(w_e - w_o )
For spaghetti: w_o = 1.0g basis, w_e = 10.3g, w_d= 0.856g
k₁ ^* = 1.86 x 10³ exp (-8.84 x 10³ /R_g T) (min⁻¹ )
k₃ ^* = 6.07 x 10⁻¹ exp (-4.05 x 10³ /R_g T) (min⁻¹ )
(At boiling temperature, k₃ ^* was 3.0 times this value)
For hiyamugi : w_o = 1.0g basis, w₄ = 8.09 w_d = 0.778g
k₁ ^* = 6.29 x 10⁴ exp (-1.03 x 10⁴ /R_g T) (min⁻¹ )
k₃ ^* = 1.81exp (-3.63 x 10³ /R_g T) (min⁻¹ )
(At boiling temperature, k₃ * was 2.1 times this value)
where, w_AR and w_STD (g) : weights of soaked material and drying state of dissoluted material, θ(min): cooking time, T(℃): cooking temperature, and R_g (cal/g-mol.゜K): gas constant.