Experimental study of agitator geometry and speed on heat transfer coefficients for both Newtonian and time dependent Power law fluids

• Published in: Heat and mass transfer Vol. 56; no. 12; pp. 3167 - 3175
• Main Author: Ansar Ali, S. K.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-12-2020; Springer Nature B.V
• Subjects: Agitation; Coils; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Heat transfer; Heat transfer coefficients; Impellers; Industrial Chemistry/Chemical Engineering; Newtonian fluids; Non Newtonian fluids; Original; Power law; Thermodynamics; Time dependence; Vessels; Agitated vessel; Aqueous solutions; Agitator geometry; Heat transfer coefficients; Agitator speed; Modified Wilson plot
• ISSN: 0947-7411; 1432-1181
• DOI: 10.1007/s00231-020-02881-2

Experimental studies on heat transfer coefficients were carried out of Newtonian and time dependent power law fluids in mechanically agitated vessel. Three different Non-Newtonian fluids containing 0.5%(n = 0.973), 1%(n = 0.851), 2%(n = 0.793) CMC (Carboxy Methylcellulose) and water were studied in the coil and 1, 2 and 4 percentages (n = 0.698) Non-Newtonian solutions of CMC in the test vessel. In this section of investigation we are focusing on heat transfer from wall to agitated vessel. In order to find results, the entire experimental data were discussed for jacketed vessel in three different impeller diameter and different speeds. It has been observed that a Modified Wilson plot is most appropriate for finding individual heat transfer coefficients. Data of 1, 2 and 4% CMC, for three impeller diameters, has been correlated and the overall heat transfer coefficient have been approximated with standard deviation
8.03%.