Oil point determination of selected bulk oilseeds under compression loading

In the present study, barberries were poured into a topless cylinder with a diameter of 55 mm and were subjected to axial compression force up to 440 kg (4,314.926 N). Effects of duration of water exposure, loading rate, and number of layers were investigated on momentary juice mass, Stress–strain behavior, and stress‐relaxation behavior. Considering momentary porosity, the momentary juice mass, stress–strain, and stress‐relaxation behaviors of the berries were modeled by inverse tangent function, exponential function, and One‐term Maxwell model, respectively. The extraction yield of juice (EYJ), specific absorbed energy by berries (SAEB), and efficiency index of energy (EIE) were calculated, and their analysis of variance and optimization were performed. The results showed that the R2 of the exponential model for the Stress–Strain diagram, Maxwell model for relaxation behavior, and inverse tangent model for momentary juice mass variation were more than 0.975, 0.985, and 0.995, respectively. The effects of the three operating parameters on the stiffness factor of springs and damping factor of dashpot were significant at 5%. Furthermore, the effects of the three input variables on the juice point force, juice point energy, EYJ, SAEB, and EIE were significant at 1%. Practical Applications The first step in producing barberry products in accordance with international food standards is barberry juice extraction. In the current study, the axial pressure method, one of the conventional barberry juicing methods, was investigated. This method has more ability to control the quality of juice than other methods. Traditionally, fruits are soaked in water for several hours before barberry juicing. Also, in the loading stage, rigid plates are placed between the fruit layers. Duration of water exposure, loading rate, and the number of layers are the three major influential factors in the juicing process. The information obtained from this article can help optimize the barberry juicing process using existing axial pressure devices. Besides, the results can be used in the optimal design of the barberry‐juicing device.

Section: Resultsmentioning

confidence: 99%

Extracting barberry juice: Mathematical models describing loading stage, stress‐relaxation behavior, and momentary juice mass

Mirzabe

Hajiahmad

Asadollahzadeh

2021

“…In a study by Guy et al (), the bulk density of camelina seeds representing different genotypes was determined in the range of 636–666 kg m −3 . According to Akangbe and Herak () the bulk density of camelina seeds can be up to 1,047 kg m −3 and true density to 1,147 kg m −3 .…”

Section: Resultsmentioning

confidence: 99%

“…In a study by Guy et al (2014), the bulk density of camelina seeds representing different genotypes was determined in the range of 636-666 kg m −3 . According to Akangbe and Herak (2017) with 80 kg N ha −1 to 1.45 g in unfertilized seeds. Czarnik et al (2017) reported an increase in the 1,000 seed weight of camelina when the fertilizer rate was increased from 50 to 100 kg N ha −1 .…”

Section: Thermal Propertiesmentioning

confidence: 99%

Thermophysical properties of camelina (Camelina sativa (L.) Crantz) seeds fertilized with nitrogen

Ropelewska

Jankowski

2019

The aim of this study was to evaluate the effect of nitrogen fertilization (0, 40, 80, 120, 160 kg N ha−1) on changes in selected physical, thermal, and geometric parameters of camelina seeds. Samples 0 kg N ha−1 and 40 kg N ha−1 formed a homogenous group with lower values of 1,000 seed weight and differed significantly from the second homogeneous group of samples 80, 120, and 160 kg N ha−1 with higher 1,000 seed weight. Nitrogen fertilization did not exert a significant effect on bulk density, true density, or porosity. Fertilization had no significant effect on the thermal properties of camelina seeds. Based on all linear dimensions and shape factors, samples 0 and 40 kg N ha−1 formed one homogenous group and were significantly different from the remaining samples. Samples 0 and 40 kg N ha−1 were characterized by the lowest values of linear dimensions, including length, width, surface area, profile specific perimeter, and convex perimeter, the lowest values of selected shape factors, including diameter range, standard deviation of all radii, Blair‐Bliss coefficient, and Danielsson coefficient, as well as the highest values of the radius ratio and roundness. Practical Applications Nitrogen fertilization strongly influences the properties of camelina seeds. Camelina seeds subjected to 120 kg N ha−1 were characterized by the highest dimensions, such as: length, width, surface area, and high values of 1,000 seed weight and they may be most desirable to be used in practice.

“…More oil was given off at the higher compressive stresses than at lower ones. Higher yields, especially during the first compression cycles are explained by the respective pressure ratios (Akangbe & Herak, ). A low pressure ratio results in higher yield while a high ratio limits yield during any compression cycle.…”

Section: Resultsmentioning

confidence: 99%

“…These were observed through lateral orifices located 15 mm from the base of the pressing vessel and with the aid of an auxiliary digital indicator mounted by the pressing rig enabling real-time visual observation of both compressive force and deformation. The pressure ratio (Akangbe & Herak, 2017) is a further treatment of the oil point pressure and refers to the ratio of the pressure at oil point to the applied compressive stress during each compression cycle. where m O (g) is the mass of expressed oil and m ss (g) is the mass of seeds pressed.…”

Section: Determining Mechanical Response and Performance Parametersmentioning

confidence: 99%

Compressive stress, repetitive strain, and optimum expression of oil from bulk volumes of sesame seeds

Akangbe

Herák

2018

Compressive expression of oil from bulk seeds is a self‐limiting process and commonly adopted techniques for optimizing oil recovery result in alterations of the product and its quality. In this study, effects of select magnitudes of compressive stress and repetitive strain on mechanical response and performance during cold compressive expression of oil from sesame seeds were investigated and responses modeled using forward stepwise regression technique. Significant gains in oil yield and performance were achieved through repeated induction of strain and by increasing magnitudes of the applied stress. Cumulative improvement in the performance of the scheme over existing single cycle compression techniques ranged between 34.1 and 161.9% over the range of treatments investigated. Corresponding improvement in mechanical response was also achieved. Specific mechanical energy demand was less with every additional compression cycle. The pressure ratio at the oil point during each compression cycle was an important indicator of recoverable oil. Practical applications A technique for maximizing the yield of oil from oilseeds and efficiency during cold compressive expression is presented which may be incorporated in the design of compression devices or similar systems, which would permit repeated induction of stress with a view to optimizing process efficiency without denaturing the product or altering its quality. The pressure ratio at the oil point is also presented, which is a fitting indicator of requisite stress for optimizing yield and performance.