scholarly journals Experimental Research of Moisture Evaporation Process from Biomass in a Drying Chamber

2015 ◽  
Vol 23 ◽  
pp. 01053 ◽  
Author(s):  
E.E. Bulba ◽  
A.A. Malinovsky
Keyword(s):  
Experimental Research ◽  
Evaporation Process ◽  
Moisture Evaporation ◽  
Drying Chamber

Analysis of the moisture evaporation process during vacuum freeze-drying of koumiss and shubat

2016 ◽  
Vol 53 (5) ◽  
pp. 1571-1578 ◽  
Author(s):  
Azret Utebaevich Shingisov ◽  
Ravshanbek Sultanbekovich Alibekov
Keyword(s):  
Freeze Drying ◽  
Evaporation Process ◽  
Moisture Evaporation

Test Rig Design to Explore Water Droplet Behavior in a Four Stage Axial Compressor

2013 ◽  
Author(s):  
S. Clauss ◽  
J. P. Schnitzler ◽  
B. Barabas ◽  
P. S. Nagabhushan ◽  
F. K. Benra ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Experimental Research ◽  
Gas Turbines ◽  
Water Injection ◽  
Axial Compressor ◽  
Evaporation Process ◽  
Test Rig ◽  
Numerical Investigations ◽  
Stationary Test ◽  
Wall Interaction

The efficiency of gas turbine cycles can be enhanced by many applications and combinations according to the choice of the thermodynamic cycle. Gas turbine cycles which operate with humid air and water injection at different locations of the compressor are in the focus of present thermodynamic analysis and experimental research. Reasoned by their high potential in efficiency and power output augmentation, they have been implemented on many industrial gas turbines. The evaporation process of water droplets, especially at high temperature and pressure levels has been recently investigated with the laser based measurement technique Phase Doppler Particle Analyzer (PDPA) in detail in a stationary test rig at the University of Duisburg-Essen. The focus of these investigations was on the analysis of the evaporation process in a free stream or cross flow without droplet wall interaction [1–5]. In this paper the development of a novel four stage axial compressor test rig which is designed for water injection will be introduced and results of numerical investigations will be presented. This test rig has been designed to adopt the results from the stationary test rig to a real compressor. The first part of the paper deals with the mechanical and aerothermodynamic design of the test rig. Certain design parameters, the optical access for the PDPA measurements and a comparison between numerical and experimental results without water injection are outlined. In the second part of the paper, first comparative results from numerical investigations of the compressor performance in dry and wet compression operating conditions are presented. Furthermore, numerical results for droplet wall interaction in the four stage axial compressor are shown. This analysis outlines the need for further experimental research in the future to validate numerical methods with accurate droplet wall interaction behavior in turbomachines.

scholarly journals Coal Moisture Variations in Response to Rainfall Events in Mine and Coal-Fired Power Plant Stockpiles—Part 2: Evaporation

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1366
Author(s):  
Quentin Peter Campbell ◽  
Marco le Roux ◽  
Fardis Nakhaei
Keyword(s):  
Laboratory Experiments ◽  
Evaporation Process ◽  
Ambient Conditions ◽  
Moisture Evaporation ◽  
Rainfall Events ◽  
Heating Value ◽  
Surface Evaporation ◽  
Fine Coal ◽  
Coal Beds ◽  
Rate Of Evaporation

Additional moisture added in coal stockpiles due to rain and other climatic processes causes a significant problem worldwide, which leads to not only decrease in the heating value of the coal but also creates an extra efficiency penalty. Therefore, it is important to make some predictions for control of coal moisture within stockpiles after the rainfall. When the rain falls on the stockpile, it either runs off the surface or infiltrates the stockpile. The infiltrated water may evaporate from the surface, drain or stay within the stockpile. The aims of this study (parts 1 and 2) are to describe and compare the changes in coal moisture content following rainfall events. The mechanisms of runoff, infiltration and drainage after rainfall were described in the first paper of this series. In part 2 the influence of coal particle size and ambient conditions on the rate and depth of moisture evaporation within the stockpile is investigated. The laboratory experiments showed cyclic events of adsorbing moisture overnight and desorbing this moisture during the day as part of the coal surface evaporation process. The rate of evaporation from the surface of the fine coal stockpile was faster than the coarse stockpile; however, the coarse stockpile experienced a more efficient evaporation process because of its porous structure. Fine coal beds experienced evaporation only near the surface, while the maximum influencing layer of evaporation is a depth of 0.4 cm below the surface in coarse coal beds.

scholarly journals Effect Carrier Agent Formulation in Drying Rate and Antioxidant Activity of Roselle Extract

2018 ◽  
Vol 156 ◽  
pp. 02010
Author(s):  
Febiani Dwi Utari ◽  
Mohammad Djaeni ◽  
Wahyu Zuli Pratiwi ◽  
Muhammad Alver Syahputra ◽  
Uma Fadzilia Arifin
Keyword(s):  
Antioxidant Activity ◽  
Moisture Content ◽  
Nutritional Value ◽  
Drying Rate ◽  
Evaporation Process ◽  
Drying Process ◽  
Moisture Evaporation ◽  
Drying Temperature ◽  
Natural Colorant ◽  
Speed Up

Roselle (Hibiscus sabdarifa L) contains anthocyanins as the natural colorant and antioxidant. Drying the roselle extract was aims to produce the dry product that easy consumption as antioxidant. The carrier agent was added in roselle extract to improve the drying rate and maintain the nutritional value. This research studied the effect of carrier agent in drying rate and antioxidant activity. The method consists of two step involving roselle extraction using ultrasonic and the drying process. The roselle extraction by ultrasonic use the water as the solvent. The carrier agent (0%,5%,10% of maltodextrin) was added in roselle extract. The mixture was then dried in tray dryer dehumidification using zeolite in drying temperature 50,60, and 70⁰C. As the response, the moisture content was observed by gravimetry every 15 minutes for 150 minutes. The result showed that Page model was fitted to determine the constant of drying rate. Higher concentration of carrier agent enhanced the moisture evaporation process. Based on the DPPH analysis, the degradation of antioxidant activity in temperature 70⁰C was 2.14 times higher than in temperature 50⁰C. As the conclusion, addition of maltodextrin can speed up the drying process and retain the antioxidant activity of.

scholarly journals Design and Development of Fish Natural Convection Drying Facility

2013 ◽  
Vol 12 (1) ◽  
Author(s):  
Manuel A. Bajet, Jr.
Keyword(s):  
Renewable Energy ◽  
Natural Convection ◽  
Relative Humidity ◽  
Moisture Content ◽  
Experimental Research ◽  
Drying Rate ◽  
Drying Time ◽  
Fish Samples ◽  
Convection Dryer ◽  
Drying Chamber

Fish drying facility was designed, developed and tested to determine itsperformance, and characterization as a natural convection dryer for stunted tilapia.Parameters in the study were air temperature, relative humidity, drying chamber,moisture content, drying time, capacity and rate. Experimental research design wasused and materials includes, lumber painted in black and used as frames, plasticscreen mesh, cellophane, black plain sheet and stones.. Findings disclosed that dryingrate were noted at the highest during first two hours internal with an average dryingrate of 7.20 grams per minute. Average drying rate after the three trials was 2.63grams per minute. The moisture content of the samples was reduced from 92.68%-75.23% during the 20 hours of drying and weights of fish samples were also reducedfrom 20 to 15 kilograms. Further, results on relative humidity was higher at theupper trays compared that the lower trays. Return of investment was 72% and has apayback period of 0.05 year. Keywords: Renewable Energy, Project and Experimental Research, NaturalConvection Dryer, Vigan City, Ilocos Sur, Philippines

scholarly journals Experimental study of moisture evaporation process with different soil characteristics

2019 ◽  
Vol 7 (2) ◽  
pp. 78-83
Author(s):  
Ni An ◽  
Chao-Sheng Tang ◽  
Shi-Kang Xu ◽  
Xue-Peng Gong ◽  
Bin Shi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Soil Characteristics ◽  
Evaporation Process ◽  
Moisture Evaporation

On the Shape of Field-Ion Emitters

1976 ◽  
Vol 34 ◽  
pp. 520-521
Author(s):  
H.C. Eaton ◽  
B.N. Ranganathan ◽  
T.W. Burwinkle ◽  
R. J. Bayuzick ◽  
J.J. Hren
Keyword(s):  
Grain Boundary ◽  
Spherical Shape ◽  
Theoretical Strength ◽  
Evaporation Process ◽  
Field Evaporation ◽  
Geometric Information ◽  
Field Ion Microscopy ◽  
Considerable Error ◽  
True Shape ◽  
Ion Microscopy

The shape of the emitter is of cardinal importance to field-ion microscopy. First, the field evaporation process itself is closely related to the initial tip shape. Secondly, the imaging stress, which is near the theoretical strength of the material and intrinsic to the imaging process, cannot be characterized without knowledge of the emitter shape. Finally, the problem of obtaining quantitative geometric information from the micrograph cannot be solved without knowing the shape. Previously published grain-boundary topographies were obtained employing an assumption of a spherical shape (1). The present investigation shows that the true shape deviates as much as 100 Å from sphericity and boundary reconstructions contain considerable error as a result.Our present procedures for obtaining tip shape may be summarized as follows. An empirical projection, D=f(θ), is obtained by digitizing the positions of poles on a field-ion micrograph.

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

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