Design an efficient air impingement nozzle array

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Chemical Engineering Progress

OSTI ID:110146

Steinberg, N I

Direct air impingement is the most commonly used system for heating, cooling,and drying webs and films. Air impingement heat-transfer systems blow jets of air (or other gas) perpendicular to the web from an array of nozzles. These may be slot nozzles positioned across the web or a two-dimensional array of round nozzles, typically holes in a plate. Designing air impingement systems essentially means specifying the key geometric parameters that control the heat-transfer coefficient: slot width, slot-to-slot pitch, and slot-to-web stand-off distance, as well as some secondary parameters that affect heat transfer uniformity in the longitudinal and transverse directions. Slot nozzle array designs based on published optimization correlations usually have a near-maximum heat-transfer coefficient for a given impingement velocity, but an accessibly high nozzle area per unit impinged area. This increase construction and operating cost because the air volumes are too high. This article addresses that problem by providing a systematic design procedure along with the required design data.

• OSTI ID: 110146
• Journal Information: Chemical Engineering Progress, Journal Name: Chemical Engineering Progress Journal Issue: 8 Vol. 91; ISSN CEPRA8; ISSN 0360-7275
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AIR FLOW
COOLING SYSTEMS
DESIGN
DRYERS
ENERGY EFFICIENCY
FLOW RATE
HEAT EXCHANGERS
HEATERS
NOZZLES
PROCESS HEAT