Simulation and Performance of a Solar Drying Unit with Storage for Aromatic and Medicinal Plants

2015 ◽  
Vol 11 (5) ◽  
pp. 597-607 ◽  
Author(s):  
M. Ayadi ◽  
I. Zouari ◽  
A. Bellagi
Keyword(s):  
Medicinal Plants ◽  
Mathematical Formulation ◽  
Climatic Conditions ◽  
Drying Rate ◽  
Solar Drying ◽  
Aromatic And Medicinal Plants ◽  
Transfer Equations ◽  
And Performance ◽  
Drying Curves ◽  
Main Factor

Abstract The objective of this work, based on a theoretical and experimental study, is to investigate the energy and economic performance of a totally solar drying unit with storage for aromatic and medicinal plants, to satisfy a dimensioning already carried out on a macroscopic scale for an energy request well defined: to dry a quantity of a given agricultural products during 1 day of harvest season, so between September and May, with a heat storage which relays at night. Drying experiments were conducted for spearmint grown in Tunisia. Mathematical formulation of the physical process of this solar drying unit based on conventional heat and mass transfer equations showed a certain agreement with the experimental results under climatic conditions of Tunis (Tunisia). All the experimental drying curves showed only a falling drying rate period. The main factor in controlling the drying rate was found to be the drying air temperature. It was observed that this unit is able to dry more than 2.5 kg of spearmint per day with a moisture reduction efficiency of 70%. It was found that for all the period of harvest, so for 5 months assumed dryer used per year, the payback period is 3.6 years.

scholarly journals Mathematical Model for Solar Drying of Grains

2019 ◽  
pp. 1-18
Author(s):  
A. O. Fagunwa ◽  
O. A. Aregbesola ◽  
M. O. Faborode
Keyword(s):  
Mathematical Model ◽  
Thermal Properties ◽  
Moisture Content ◽  
Climatic Conditions ◽  
Drying Rate ◽  
Solar Drying ◽  
Drying Process ◽  
Complex Procedure ◽  
Unique Method ◽  
Complex Phenomena

Mathematical modeling of drying process is a complex procedure that should be carefully done. Moreso, model for solar drying, which is a unique method of drying due to constant fluctuation in the climatic conditions, requires complete integration of the complex phenomena that are involved for accurate prediction of moisture content and drying rate. A mathematical model was developed from heat and mass balance equation considering the physical and thermal properties of the grain, meteorological factors and convective heat transfer during solar drying of grains. The data obtained from the model was compared with experimental results obtained using a solar dryer to dry five selected grains – cowpea, soyabean, groundnut, maize and sorghum at airflow rates of 0.22 m/s, 0.76 m/s and 0.94 m/s. The results from statistical analysis and regression analyses used to compare the results showed that the model is adequate in predicting the moisture content and drying rate of the selected grains as well as other agricultural products with closer physical and thermal properties.

scholarly journals The Phytochemistry of Cherokee Aromatic Medicinal Plants

Medicines ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 121 ◽  
Author(s):  
William Setzer
Keyword(s):  
Native Americans ◽  
Medicinal Plants ◽  
Biological Activities ◽  
Herbal Medicines ◽  
Black Cohosh ◽  
Cimicifuga Racemosa ◽  
Traditional Uses ◽  
Aromatic And Medicinal Plants ◽  
Phytochemical Investigation ◽  
Phytochemical Constituents

Background: Native Americans have had a rich ethnobotanical heritage for treating diseases, ailments, and injuries. Cherokee traditional medicine has provided numerous aromatic and medicinal plants that not only were used by the Cherokee people, but were also adopted for use by European settlers in North America. Methods: The aim of this review was to examine the Cherokee ethnobotanical literature and the published phytochemical investigations on Cherokee medicinal plants and to correlate phytochemical constituents with traditional uses and biological activities. Results: Several Cherokee medicinal plants are still in use today as herbal medicines, including, for example, yarrow (Achillea millefolium), black cohosh (Cimicifuga racemosa), American ginseng (Panax quinquefolius), and blue skullcap (Scutellaria lateriflora). This review presents a summary of the traditional uses, phytochemical constituents, and biological activities of Cherokee aromatic and medicinal plants. Conclusions: The list is not complete, however, as there is still much work needed in phytochemical investigation and pharmacological evaluation of many traditional herbal medicines.

Calculation and Simulation Azimuth Hydrostatic Thrust Bearing of a Large Alt-Azimuth Telescope

2013 ◽  
Vol 364 ◽  
pp. 28-32
Author(s):  
Long Huang ◽  
Wen Li Ma ◽  
Jin Long Huang
Keyword(s):  
Thrust Bearing ◽  
Structure Parameter ◽  
Tracking Accuracy ◽  
Low Friction ◽  
Element Analysis ◽  
Hydrostatic Bearing ◽  
Wide Range ◽  
And Performance ◽  
Large Telescopes ◽  
Main Factor

The use of hydrostatic bearing for support of telescope offers a number of potential performance advantages, but the structure parameter of bearing is the main factor which influence the bearing. The temperature rise of bearing is also important for the stiffnees of the telescope mount.In addition to the known benefit of mount stiffness and tracking accuracy from exceedingly low friction, the hydrostatic bearing provides a wide range of geometric possibilities for large telescopes [1].This paper analyzes various familiar hydrostatic bearing for the azimuth and elevation axes of telescope.Theoretical calculation and simulation show that the performance of bearing meets telescope’s design requirements.The principle and process of this work and Finite Element Analysis (FEA) are introduced in detail. According to the CFX result, the structure parameter and performance of bearing ,temperature field and pressure distribution have obtained.

scholarly journals Ethno Botanical Studies of District Dera Ghazi Khan, Province Punjab, Pakistan

2020 ◽  
Author(s):  
Tahira Aziz Mughal ◽  
Hamna Yasin ◽  
Zubaida Yousaf ◽  
Ismat Naeem Naeem
Keyword(s):  
Medicinal Plants ◽  
Rural Areas ◽  
Neurological Diseases ◽  
Herbal Medicines ◽  
Climatic Conditions ◽  
Structured Interviews ◽  
Medicinal Uses ◽  
Plant Parts ◽  
Floral Diversity ◽  
Natural Drugs

Abstract Background The chief aim of this study was to enlist the Ethnobotanical uses of plants in Dera Ghazi Khan, Punjab, Pakistan. Due to unique geographical and climatic conditions, Pakistan has a great floral diversity. Plants have been used by the indigenous people for treatment of different ailments since long. They are still dependent on the plants for their domestic purposes. Moreover, plants are used as first aid to treat diverse ailments such as hepatic disorders, cardiac diseases, neurological diseases, anticancer, respiratory diseases, ENT problems, gynecological problems etc. The traditional uses of medicinal plants lead to the discovery of natural drugs. This is first quantitative ethno medicinal documentation of medicinal plants in Dera Ghazi Khan. Punjab, Pakistan. Methods This ethno botanical information was collected from about 200 informants including male and female. Sample size was determined by statistical formula. The informative data was based on semi-structured interviews, group discussions, Questionnaire and field visits. Then the data was analyzed by applying different quantitative indices such as Informant Consent Factor (ICF), Use value (UV), Relative Frequency of Citation (RFC) and the Fidelity level (FL). Results Almost 185 plants belonging to 52 families were reported. Most-frequently cited families were Astreaceae (20 species) and Solanaceae (10 species). The most dominant life form was herbs (51%). The most-used plant parts were leaves (68%), followed by whole plant (65%), Most common mode of administration is extraction (50%). Generally herbal medicines were acquired from fresh plant material. Many species were reported with their different medicinal uses as has been reported in literature. Conclusions This ethno botanical documentation revealed that the plants are still used by natives of rural areas in their day-to-day lives. This study provides basis for the conservation of local flora. Plants with high ICF, UV and FL can be further used for phytochemical and pharmacological studies. This documentation could provide baseline information which can be used to develop new plant-based commercial drugs.

scholarly journals Small Scale Investigation of the Potential of Solar Drying of Water Hyacinth (Eichhornia Crassipes) as A Control Measure in Makurdi

2015 ◽  
Vol 6 ◽  
pp. 129-138
Author(s):  
A O Edeoja ◽  
A O Owolabi
Keyword(s):  
Water Hyacinth ◽  
Mixed Mode ◽  
Eichhornia Crassipes ◽  
Control Measure ◽  
Small Scale ◽  
Drying Rate ◽  
Aquatic Weed ◽  
Solar Drying ◽  
Water Weed

Water hyacinth is the world's worst water weed that is responsible for many environmental and economical problems. Nigerian fresh waters have been infested with this aquatic weed. In this work, a Natural Convection Mixed Mode Solar Dryer for drying water hyacinth to about 10% of its moisture content was constructed and tested as a component of controlling its infestation of the River Benue. The performance of the dryer was compared with the traditional open–air sun drying as the control for drying water hyacinth in Makurdi, Benue State Nigeria. The water hyacinth was dried for 8 hours each day for 4 days. 500g of water hyacinth on wet basis was dehydrated by about 437g on dry basis in 20 hours in the dryer while the control required 32 hours. The dryer was found to be technically more suitable for drying water hyacinth both in terms of the drying rate and quality of the dried product.

Study on Numerical Simulation and Performance of the Secondary Throttle Choke Used in the Oil Field

2013 ◽  
Vol 712-715 ◽  
pp. 1201-1204
Author(s):  
Hai Feng Zhao ◽  
Yan Xu
Keyword(s):  
Numerical Simulation ◽  
Pressure Change ◽  
Simulation Method ◽  
Differential Pressure ◽  
Oil Field ◽  
Pressure Curve ◽  
Flow Pressure ◽  
Flow Changes ◽  
And Performance ◽  
Main Factor

The numerical simulation method is adopted to calculate the flow field of the secondary throttle choke used in the oil field. The relationships among the flow of the secondary throttle choke, differential pressure and diameters are studied. The results of numerical simulation coincide with the experiment values, which verify that the method is correct. The results show that the flow increases with the increasing of differential pressure of the throttle choke at both ends, but the increment of the flow gradually decreases. The structure could maintain the flow not to change basically when differential pressure change in a certain scope. When the throttle diameter turns out to be small, the flow decreases, and flow-pressure curve gradually becomes aclinic. Compared with the first-class throttle diameter, the second-class throttle diameter is the main factor which effects flow changes.

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