Effects of Drying Air Temperature on the Structural Properties of Garlic Evaluated During Drying

Figures & data

Figure 2 Apparent density with respect to X/X ₀ during drying.

Figure 1 Particle density with respect to X/X ₀ during drying.

Table 1  Particle density, apparent density, and glass transition temperature for garlic samples at 0.1 X/X ₀

Tdrying (°C)	ρ p (kg/m^3)	ρ b (kg/m^3)	Tg (°C)
40	1539.11 ± 103.21	1333.45 ± 3.47	49.65
50	1506.86 ± 7.21	1267.41 ± 1.82	46.62
60	1430.22 ± 8.58	1191.05 ± 15.82	45.13

Table 2  Coefficients corresponding to Eq. (13) for particle density, apparent density, and apparent porosity for garlic samples dehydrated at 40, 50, and 60°C

		Coefficient
Parameter	Tdrying (°C)	A	B	C	D	E	F	R ^2
ρ p (kg/m^3)	40	910.48	0.086	111,488.57	113.34	823.52	0.63	0.98
	50	31,322.86	8.55	31,728.11	8.68	1531.97	0.23	0.85
	60	1444.30	0.17	68,024.89	25.00	66,864.08	24.68	0.98
ρ b (kg/m^3)	40	10,251.39	68.82	15,755.42	77.02	1341.84	0.24	0.98
	50	1261.77	0.19	3931.75	41.58	3434.04	338.13	0.99
	60	997.32	0.00	194.32	26.30	283.43	2.01	0.90
ϵ	40	2.38	0.54	3.06	0.63	0.73	0.67	0.91
	50	0.14	0.00	2.26	20.74	2.05	20.74	0.91
	60	0.17	0.08	1.33	45.90	0.74	45.91	0.93

Figure 3 Porosity of garlic slices during drying.

Figure 4 Microstructure of fresh garlic (a), garlic dried at 40°C (b), at 50°C (c), and at 60°C (d).

Figure 5 Effective diffusivity of garlic slices during drying.

Figure 6 Glass transition temperature, surface temperature, and inside temperature for garlic slices during drying.