Drying Rate and Product Quality Evaluation of Roselle (Hibiscus sabdariffa L.) Calyces Extract Dried with Foaming Agent under Different Temperatures

Table 4

Heat and mass transfer coefficients.

T; (°C)	0^−5; (m^2s^−1)				k; (W m^−1K^−1)		(W m^−1K^−1)	0^−4; (ms^−1)
40	2.77	25.63	113483.61	2.81	27.15	3.01	408.05	3.903
50	2.96	24.62	83114.76	2.70	28.80	2.94	409.19	3.996
60	3.15	22.99	77646.68	2.55	28.59	2.84	406.49	4.028

: Reynold number, : Schmidt number, : Sherwood number, and : Nusselt number.