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Effects of Delta-Shaped Obstacles on the Thermal Performance of Solar Air Heater

Adisu BekeleDepartment of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, IndiaManish MishraDepartment of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, IndiaSushanta DuttaDepartment of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India

2011en

ABI

Annotatsiya

An experimental investigation has been carried out to study the effect of delta-shaped obstacles mounted on the absorber surface of an air heater duct with an aspect ratio 6 : 1 resembling the conditions close to solar air heaters. This study encompassed the Reynolds number (Re) ranging from 3400 to 27600, longitudinal pitch of the obstacle ([Formula: see text]) varied from 3/2 to 11/2, and relative obstacle height ( e/ H) varied from 0.25 to 0.75. The relative obstacle transverse pitch [Formula: see text] and the angle of attack of flow on obstacle = 90° are kept constant during the whole experimentation. By comparing the heat transfer data obtained from the obstacle-mounted duct with that of smooth duct under similar geometrical and flow conditions, the obstacle-mounted duct enhances the heat transfer by 3.6-times at Re = 7276.82, [Formula: see text], and [Formula: see text].

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Identifikatorlar

DOI: 10.1155/2011/103502

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