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Characteristic analysis of turbulent heat diffusion in a multi-compartment structure; Takukakuka kukan kozo ni okeru ranryunetsu kakusan gensho no kaiseki

Abstract

An analysis was made on turbulent heat diffusion in a multi-compartment structure necessary for designing calorific power and environment for functional systems used in marine vessels and off-shore structures. In a multi-compartment structure, the diffusion phenomenon is complex because of movement of air flow in turbulence and buoyancy resulted from non-isothermal condition. The phenomenon is largely affected by space shapes and walls, and the conditions in heat diffusion field is governed also by shapes of opening connecting the compartments. An analysis was made by using the SIMPLE method on turbulent heat diffusion in a multi-compartment space with high Raleigh number in which natural convection is dominant. If the opening is small, the Coanda effect appears, in which air flow passing through the opening rises along the wall, wherein a high-temperature layer is formed near the ceiling, making the heat diffusion inactive. If the opening is large, a jetting flow from the opening and a large circulating flow are created, which cause active advection mixture, making temperature gradient smaller in the upper layer. Heat transfer intensity in an opening on a partition wall decays in proportion with 1/4th power of the opening ratio. 7 refs., 11 figs.
Authors:
Hu, C; Fukuchi, N [1] 
  1. Kyushu University, Fukuoka (Japan). Faculty of Engineering
Publication Date:
Oct 01, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98750999; CONF-9711147-
Reference Number:
SCA: 320204; 420400; 423000; PA: JP-97:0G4498; EDB-98:073744; SN: 98001944434
Resource Relation:
Conference: 95. meeting of the West Japan Society of Naval Architects, Seibu zosenkai dai 95 kai reikai ronbun kogai, Osaka (Japan), 14-15 Nov 1997; Other Information: PBD: 1 Oct 1997; Related Information: Is Part Of Summary of the papers of the 95th Meeting of the West Japan Society of Naval Architects. Joint meeting of three shipbuilding societies in fall, fiscal 1997; PB: 168 p.; Seibu Zosenkai dai 95 kai reikai ronbun gaiko. 1997 nendo shuki zosen sangakkai rengo koenkai
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; COMPARTMENTS; CONFIGURATION; OPENINGS; HEAT TRANSFER; FLUID MECHANICS; DIFFUSION; TURBULENT FLOW; SHIPS; MECHANICAL STRUCTURES; UNDERWATER FACILITIES; OFFSHORE OPERATIONS; WALLS; NATURAL CONVECTION; CIRCULATING SYSTEMS; ADVECTION
OSTI ID:
622787
Research Organizations:
West Japan Society of Naval Architects, Fukuoka (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98750999; TRN: JN97G4498
Availability:
Available from West Japan Society of Naval Architects, 10-1, Hakozaki 6-chome, Higashi-ku, Fukuoka-shi, Fukuoka, (Japan); OSTI as DE98750999
Submitting Site:
NEDO
Size:
pp. 67-77
Announcement Date:
Jul 24, 1998

Citation Formats

Hu, C, and Fukuchi, N. Characteristic analysis of turbulent heat diffusion in a multi-compartment structure; Takukakuka kukan kozo ni okeru ranryunetsu kakusan gensho no kaiseki. Japan: N. p., 1997. Web.
Hu, C, & Fukuchi, N. Characteristic analysis of turbulent heat diffusion in a multi-compartment structure; Takukakuka kukan kozo ni okeru ranryunetsu kakusan gensho no kaiseki. Japan.
Hu, C, and Fukuchi, N. 1997. "Characteristic analysis of turbulent heat diffusion in a multi-compartment structure; Takukakuka kukan kozo ni okeru ranryunetsu kakusan gensho no kaiseki." Japan.
@misc{etde_622787,
title = {Characteristic analysis of turbulent heat diffusion in a multi-compartment structure; Takukakuka kukan kozo ni okeru ranryunetsu kakusan gensho no kaiseki}
author = {Hu, C, and Fukuchi, N}
abstractNote = {An analysis was made on turbulent heat diffusion in a multi-compartment structure necessary for designing calorific power and environment for functional systems used in marine vessels and off-shore structures. In a multi-compartment structure, the diffusion phenomenon is complex because of movement of air flow in turbulence and buoyancy resulted from non-isothermal condition. The phenomenon is largely affected by space shapes and walls, and the conditions in heat diffusion field is governed also by shapes of opening connecting the compartments. An analysis was made by using the SIMPLE method on turbulent heat diffusion in a multi-compartment space with high Raleigh number in which natural convection is dominant. If the opening is small, the Coanda effect appears, in which air flow passing through the opening rises along the wall, wherein a high-temperature layer is formed near the ceiling, making the heat diffusion inactive. If the opening is large, a jetting flow from the opening and a large circulating flow are created, which cause active advection mixture, making temperature gradient smaller in the upper layer. Heat transfer intensity in an opening on a partition wall decays in proportion with 1/4th power of the opening ratio. 7 refs., 11 figs.}
place = {Japan}
year = {1997}
month = {Oct}
}