Pool-Boiling Cooler with Heated Wire for Low-ONB Cooling
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Solution Overview
Problem
Conventional coolers of the pool boiling method type face issues with increased Onset of Nucleate Boiling (ONB) when large heat fluxes are applied, leading to reduced cooling capacity and potential damage to heat generating bodies due to the lack of boiling nuclei near the surface.
Innovation Solution
Incorporating at least one heatable thin metal wire or thin metal film between the heat generating body and a porous cooling member to seed boiling nuclei, thereby inducing boiling at a low degree of superheat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous body is provided between the heat generating body and working fluid, then the critical heat flux is improved, but the onset of nucleate boiling rises dramatically due to lack of boiling nuclei
Solution Approach 1:
A thin metal wire or thin metal film is introduced as an intermediary component between the heat generating body and the porous cooling member. This intermediary serves dual functions: it acts as a heat transfer medium and simultaneously provides boiling nuclei to the working fluid, enabling smooth boiling at low superheat while maintaining high critical heat flux through the porous structure.
Solution Approach 2:
The cooling system combines multiple materials with complementary properties: the porous body material provides capillary action for fluid supply and vapor exhaust, while the thin metal wire/film provides thermal conduction and boiling nucleus generation. This composite structure achieves both high critical heat flux and low onset of nucleate boiling by integrating the advantages of different materials.
2Power
If large heat flux is applied to the contact part, then cooling capacity increases, but the contact part becomes covered with vapor and dry, deteriorating cooling capacity
Solution Approach 1:
The cooling member is made of a porous body that enables simultaneous supply of working fluid to the heat generating body surface and exhaust of generated vapor to the working fluid side. This porous structure prevents vapor accumulation on the contact part, allowing sustained high heat flux operation without loss of cooling capacity.
Solution Approach 2:
The thin metal wire or film continuously generates boiling nuclei that facilitate continuous boiling of the working fluid. This continuous boiling process ensures uninterrupted heat transfer from the heat generating body to the working fluid, maintaining stable cooling capacity even at high heat flux conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses the rise in ONB, allowing boiling to occur smoothly at a lower superheat, preventing overheating and damage to heat generating bodies.
Implementation Method 1
the thin metal wire or thin metal film is configured to be heatable by a passage of electric current
Implementation Method 2
a porous body comprising a working fluid supply section that supplies the working fluid to the surface of the heat generating body by capillary action
Implementation Method 3
When heat is generated in the heat generating body and the heat is transferred to the working fluid through the contact part, the working fluid present in the vicinity of the contact part boils
Implementation Method 4
When vapor is generated by boiling, the working fluid is supplied to the contact part due to the density difference between the gas and liquid
Implementation Method 5
When vapor is generated by boiling, the working fluid is supplied to the contact part due to the density difference between the gas and liquid
Data Source
AI summary
Provided is a cooler and a cooling device capable of inducing boiling at a low degree of superheat by suppressing an increase in the Onset of Nucleate Boiling. A cooler of a boiling method type for cooling a heat generating body, comprising: a container for storing a working fluid; a cooling member made of a porous body and disposed in the container so as to face a surface of the heat generating body; and at least one thin metal wire or thin metal film disposed between the surface of the heat generating body and the cooling member and configured to be heatable.