Abstract
Slot Jet Reattachment (SJR) nozzle is an extension of hics.the Radial Jet Reattachment (RJR) concept used to provide high heat and mass transfer while allowing for the control of flow exerted force on the reattachment surface. The SJR is a slot jet nozzle with a bottom plate attached to it, which is machined to direct exiting flow at a desired angle. The drying characteristics of the SJR nozzle, using air, with four exit angles on a paper sample were studied for three Reynolds numbers, three temperatures and two dry basis initial moisture contents (DBMC). A correlation to predict drying rate and moisture content was also developed. A comparison of the average drying rates showed that the +45[] and +20[] SJR nozzles performed better than the [] and the -1[] SJR nozzles respectively. The effect of increasing exit Reynolds number, temperature, and [] was to decrease the drying time. A comparison of the drying characteristics and net forces of the slot jet and SJR nozzles was also performed under the same flow power and flow exerted surface peak pressure. The same flow power results showed that +45[] and +20[] SJR nozzles performed better than the slot jet nozzle, while the 0[] SJR had drying characteristics similar to the slot jet. The slot jet performed better than the -10[] SJR nozzle. The peak pressure tests showed that -10[], 0[] and +20[] SJR nozzles performed better than the slot jet nozzle and the slot jet nozzle showed lower drying times than only the +45[] SJR nozzle. The force comparison showed that all the SJR nozzles exerted a lower net force on the impingement surface than the slot jet nozzle, under both comparison criteria. called "vision'' was also modified to simulate impingement drying of paper. The numerical results for slot jet and 00 SJR nozzle for two [] and three exit temperatures were then compared to the experimental data for the same flow power experiments. A parametric study was also conducted for 00 SJR nozzle by changing the heat transfer coefficient, exit temperature, and basis weight and thickness of the paper sample.
Alam, Syed Aftab (1998). Drying characteristics of slot jet reattachment nozzle and comparison with a slot jet nozzle. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1998 -THESIS -A42.