أرسل هذا في رسالة قصيرة: Mathematical modeling of closed-End pulsating heat pipes pperating with a bottom heat mode

 _    _      ___     ______     _____     ______  
| |  | ||   / _ \\  |      \\  |  ___||  /_____// 
| |/\| ||  | / \ || |  --  //  | ||__    `____ `  
|  /\  ||  | \_/ || |  --  \\  | ||__    /___//   
|_// \_||   \___//  |______//  |_____||  `__ `    
`-`   `-`   `---`   `------`   `-----`   /_//     
                                         `-`