Title:
HEATING TUBE HAVING GROOVED INNER SURFACE
Document Type and Number:
Japanese Patent JPH1183368
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To enhance condensation and evaporation performance by forming a plurality of fins on the inner surface along a line making a first specified angle against the tube axis and setting the depth of a plurality of notches made in these fins within a specified range of the height of each fin thereby suppressing pressure drop of coolant. SOLUTION: The heating tube 1 is made of a copper seamless pipe 2 having inner surface provided with a plurality of continuous fins 3 at a specified angle against the tube axis and a primary groove 4 is made continuously between the fins 3. The fin 3 is provided with a plurality of notches 5 along a line making an angle against the tube axis in the direction reversely to the fin 3. The notch 5 serves as a secondary groove which constitutes a double groove structure along with the primary groove. The depth Hf' of the notch 5 is set in the range of 20-40% of the height Hf of the fin 3. According to the structure, heat transfer characteristics of evaporation and condensation can be enhanced.
Inventors:
SUZUKI YOSHIO
INUI KENICHI
TOBE MASAKAZU
OTANI TADAO
INUI KENICHI
TOBE MASAKAZU
OTANI TADAO
Application Number:
JP25183697A
Publication Date:
March 26, 1999
Filing Date:
September 17, 1997
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
F28F1/40; (IPC1-7): F28F1/40
Attorney, Agent or Firm:
Tadao Hirata
Previous Patent: HEAT TRANSFER TUBE AND METHOD FOR USING THE SAME
Next Patent: ABRASIVES SUPPLY DEVICE FOR LIQUID JET WORKING APPARATUS
Next Patent: ABRASIVES SUPPLY DEVICE FOR LIQUID JET WORKING APPARATUS