Sökning: "airflow rate"

Visar resultat 1 - 5 av 43 avhandlingar innehållade orden airflow rate.

1. 1. Air diffusion and solid contaminant behaviour in room ventilation : a CFD based integrated approach

   Författare :Gery Einberg; Sture Holmberg; hazim Awbi; KTH; []
   Nyckelord :Technology; CFD modelling; airflow rate; ventilation efficiency; diffusers; solid contaminants; IAQ; TEKNIKVETENSKAP; TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : One of the most fundamental human needs is fresh air. It has been estimated that people spend comparatively much time in indoor premises. That creates an elevated need for high-quality ventilation systems in buildings. The ventilation airflow rate is recognised as the main parameter for measuring the indoor air quality. LÄS MER

3. 2. Particle motion, coating and drying in Wurster fluidized beds - An experimental and discrete element modeling study

   Författare :Liang Li; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; airflow; Wurster; coating; CFD; particle; Fluidized bed; drying; PEPT; spray; DEM;

   Sammanfattning : This thesis focuses on developing a mathematical model that is capable of predicting the fluidized bed coating process. First a basic understanding of pellet motion in a Wurster fluidized bed was established by conducting a series of experiments using the positron emission particle tracking (PEPT) technique. LÄS MER

4. 3. Ventilation Performance in Operating Rooms : A Numerical Assessment

   Författare :Cong Wang; Sture Holmberg; Sasan Sadrizadeh; Anna Bogdan; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; operating room ventilation; bacteria-carrying particles; laminar airflow; mixing ventilation; temperature-controlled airflow; computation fluid dynamics; Lagrangian particle tracking; Civil and Architectural Engineering; Byggvetenskap; Strömnings- och klimatteori; Fluid and Climate Theory;

   Sammanfattning : Surgical site infections (SSIs) remain one of the most challenging postoperative complicationsof healthcare and threaten the lives of millions of patients each year. Current evidence hasshown a positive relationship between the airborne concentration of bacteria-carryingparticles (BCPs) in the operating room (OR) and the rate of infections. LÄS MER

5. 4. Optimization of confluent jets ventilation with variable airflow

   Författare :Harald Andersson; Mathias Cehlin; Roland Gårdhagen; Högskolan i Gävle; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Confluent jets; Air distribution system; Air supply device; Ventilation performance; Indoor air quality; Thermal comfort; Experimental study; Computational fluid dynamics CFD ; Variable air volume.; confluent jets; luftdistributionssystem; tilluftsdon; ventilationsprestanda; inomhusluftkvalitet; termisk komfort; experimentell studie; Computational fluid dynamics CFD ; variabelflödessystem; Hållbar stadsutveckling; Sustainable Urban Development;

   Sammanfattning : In recent years, applications of confluent jets for design of ventilation supply devices have been widely studied. Similarly, numerous studies have been made on the potential and application of variable air volume (VAV) in order to reduce the energy demand of ventilation systems. LÄS MER

7. 5. Aerodynamic assessment of velopharyngeal function in speech

   Författare :Hans Dotevall; Göteborgs universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Speech production measurements; speech aerodynamics; velopharyngeal function; nasal airflow; perceptual speech evaluation; hypernasality; cleft palate speech; sleep disordered breathing; snoring; sleep apnea;

   Sammanfattning : Velopharyngeal function in speech was assessed by aerodynamic techniques, which were developed and tested. Temporal and dynamic characteristics of the nasal airflow pattern during the velopharyngeal closing phase in speech were studied in different patient groups. Its validity in relation to listener's perceptual evaluation of speech was analyzed. LÄS MER