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PH—Postharvest Technology: Physical Properties of Hazel Nuts

✍ Scribed by C. Aydin

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
188 KB
Volume
82
Category
Article
ISSN
1537-5110

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✦ Synopsis

Several physical properties of hazel nuts and kernels were evaluated as functions of moisture content. The average length, width, thickness, the geometric mean diameter, sphericity, unit mass and volume of nuts were 18Á03, 18Á97, 16Á58, 17Á83 mm, 97Á58%, 2Á41 g and 1Á92 cm 3 , respectively. Corresponding values for kernels were 14Á31, 13Á23, 12Á68, 13Á38 mm, 93Á57%, 1Á09 g and 1Á15 cm 3 , respectively. In the moisture range from 2Á87 to 19Á98 d.b., for the rewetted nut the bulk density decreased from 383 to 305 kg/m À3 , true density 727 to 674 kg m À3 , porosity increased from 47Á23 to 48Á85%, projected area increased from 389 to 442 mm 2 , and terminal velocity increased from 4Á21 to 5Á45 m s À1 . For the kernel, the corresponding values changed from 458 to 539, 887 to 948 kg m À3 , 43Á38 to 44Á85%, 245 to 286 mm 2 and from 7Á22 to 8Á54 ms À1 , respectively. The rupture strength of nut and kernel decreased with increasing moisture content . The highest rupture strength occurred when loaded at right angles to the longitudinal axis. In the moisture range 2Á77-19Á98% d.b., the static coefficient of friction varied from 0Á45 to 0Á72 for nut and from 0Á53 to 0Á78 for kernel over different material surface.

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