Thesis supervisor: Tibor Poós
Location of studies (in Hungarian): BME Department of Building Services and Process Engineering Abbreviation of location of studies: ÉPGET
Description of the research topic:
a.) Preliminaries:
In order to achieve optimal design, operation and control for a fluidized bed, it is very important to understand the flow and heat transfer characteristics. In the past physical experiments have been conducted to quantify the heat transfer coefficients (HTC), but these studies were focused mainly on the constant drying rate period. After the critical moisture content is reached, the continuous wetting of the surface of the drying material ceases, and dry spots appear on it, which is called the phase of drying with a falling drying rate. Due to dry spots, the drying rate decreases and the surface temperature increases. In this stage, the free moisture content evaporates on the drying surface, while the dry spots only contain internal moisture.
Many publications have already created in international journals, conferences, project works, and BSc and MSc theses.
b.) Aim of the research:
The purpose of this research is the determine a relationship between the volumetric heat transfer coefficient (αa) and the moisture content (X) of the granular material during the falling drying rate period. During the research, it is necessary to carry out laboratory measurements with fluidization drying of different granular materials in the case of different drying gas characteristics.
c.) Tasks, main items, necessary time:
• Collection and study of literature data and models regarding the fluidization drying of granular materials, mainly during the period of falling drying rate (1 semester).
• Development of laboratory equipment, with the help of which fluidization drying can be carried out. Carrying out laboratory measurements to determine the drying rate with different air condition indicators and material characteristics (2 semesters).
• Exploring the relationships between necessary material characteristics and operating parameters, writing the heat and mass transfer model, and specifying the application conditions. (1 semester).
• The validation of the heat and mass transfer model for the phase of falling drying rate (2 semesters).
• Publishing the results in scientific journals and preparing the PhD thesis (2 semesters).
d.) Required equipment:
• Fluidization drying laboratory measuring equipment.
• Instruments and sensors are capable of measuring various operational parameters, as well as data logger and data recording software for automatically logging measured data.
• IT hardware and software background to carry out the research work.
The listed tools are provided to start the research.
e.) Expected scientific results:
• Development of laboratory measuring equipment suitable for testing the falling drying rate at different air temperatures, air velocities and static bed heights.
• Creating a correlation suitable for determining the drying rate for the falling drying rate period.
• Effect of parameters affecting drying rate.
f.) References:
[1] Poós, Tibor; Szabó, Viktor: Modeling of heat and mass transfer in fluidized bed dryers using the volumetric heat transfer coefficient. Part 1: Equations describing the simultaneous heat and mass transfer. DRYING TECHNOLOGY 40: 11 pp. 2335-2344., 10 p. (2022)
[2] Szabó, Viktor; Poós, Tibor: Modeling of heat and mass transfer in fluidized bed dryers using the volumetric heat transfer coefficient. Part 2: calculation algorithm based on the heat and mass transfer model. DRYING TECHNOLOGY 40: 11 pp. 2345-2359., 15 p. (2022)
Required language skills: English Number of students who can be accepted: 1
Deadline for application: 2024-04-23
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
Login
