Selected engineering properties of tiger nut as a function of moisture content and variety

Abstract

Some physical and mechanical properties of two tiger nut varieties (Sarışeker and Balyumru) were determined at four moisture contents. Physical properties including length, width, thickness, geometric mean diameter, mass, 1000-tuber mass, bulk density, tuber density, surface area, terminal velocity, angle of repose, porosity, and friction coefficient were affected by moisture content at a 1% probability level, excluding sphericity. All parameters decreased with a decrease in moisture content except tuber density, porosity, and firmness. Variety only had a statistically significant effect on width, geometric mean diameter surface area, and terminal velocity at different probability levels. Force, deformation, firmness, energy absorbed, and power requirement, which were investigated as mechanical properties, were also affected by moisture content at a 1% probability level. It was also found that the variety and loading position had no significant effect on firmness and energy absorbed, respectively. Varieties showed differences in terms of 1000-tuber mass, sphericity, terminal velocity and angle of repose, length, geometric mean diameter, surface area, porosity, force, and energy absorbed at different probability levels.

The Effects of Moisture Content and Loading Orientation on Some Physical and Mechanical Properties of Tiger Nut

“…These values are close to the general value of Chinese tiger nut variety Y. Our sphericity values are slightly larger than those of (Abano and Amoah, 2011;Ince et al, 2017). Compared with foreign varieties, the sphericity value of Chinese tiger nut is larger.…”

“…The result indicated that the axial dimensions are increased with the increasing of moisture content. Ince et al (2017;Oyerinde and Olalusi, 2013) have reported similar trends for two tiger nut varieties. Abano and Amoah (2011) reported that the dimension of black variety of tiger nut ranged from 13.71 to 16.16 mm in length, 12.46 to 14.51 mm in width, 10.40 to 11.94 mm in thickness and 11.80 to 13.69 mm in geometric mean diameter for moisture content from 17 to 32% (w.b.).…”

“…The coefficient of the equation shows that the change rate of surface area with moisture content is very large. Duncan's (Ince et al, 2017) multiple range test results demonstrate that the Y variety lengths belong to the same group statistically for all five moisture content levels, with no significant differences between values. -------------------------------------------------------------------------------------------------------------- ------------------------------------------------------- 0.000 ** 0.000 ** 0.001 ** 0.000 ** 0.000 ** 0.628 ns *, **: Significant at the levels of 5 and 1%, respectively.…”

“…Oyerinde and Olalusi (2013) measured the physical properties of yellow and brown tiger nut varieties under varying moisture content, demonstrating the larger size of the yellow tiger nut compared to the brown varieties. Ince et al (2017) investigated the physical and compression properties of two Turkish varieties of tiger nut under varying moisture content and determined that the variety and loading direction have relatively little effect on firmness.…”

A Review of Some Prevention Strategies against Contamination of Cyperus esculentus and Tigernut-Derived Products of Economic Importance

“…Although physical contamination of tigernut tubers could be considered as being prevalent, the contaminants involved is easy to identify and remove [23]. Ability to design suitable machinery and processing equipment for tigernut tubers based on engineering properties of the tubers could significantly reduce physical contamination of the tubers [24,25].…”