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\title{¶à¿×²ÄÁÏÖÆ±¸ÖÐÔì¿×¼ÁÌå»ý·ÖÊýµÄ°²È«´°¿ÚÉè¼Æ\\[0.3em]
\large ´ÓÎïÀíÄ£Ð͵½¹¤³ÌÔ¼ÊøµÄ¶¨Á¿·ÖÎö}
\author{»ùÓÚ·Ûĩұ½ð¾­µäÀíÂÛ}
\date{}

\begin{document}

\maketitle

\section{ÒýÑÔ}
ÔÚ·Ûĩұ½ð·¨ÖƱ¸¶à¿×²ÄÁÏʱ£¬Ôì¿×¼ÁÌå»ý·ÖÊý \(v_{\text{pore}}\) ÊǾö¶¨ÉúÅ÷³ÉÐÍÐÔ¡¢¿×϶½á¹¹¼°ÉÕ½áºóºê¹ÛÐÔÄܵĹؼü²ÎÊý¡£¹ý¸ßµÄÔì¿×¼Áº¬Á¿»áµ¼Ö»ùÌå²»Á¬Ðø£¬ÉúÅ÷ËúÏÝ£»¹ýµÍÔò¿ÉÄÜʹÔì¿×¼Á±»ÍêÈ«°üÂñ£¬ÎÞ·¨ÓÐЧȥ³ý¡£±¾ÎÄ»ùÓÚ¾­µä¶Ñ»ýÀíÂÛºÍÉøÁ÷ÀíÂÛ£¬ÍƵ¼Ôì¿×¼ÁÌå»ý·ÖÊýµÄÀíÂÛ°²È«´°¿Ú£¬²¢½áºÏ¹¤³Ìʵ¼ùÖеĶîÍâÔ¼Êø£¨ÉÕ½áÊÕËõ¡¢È¥³ý¶¯Á¦Ñ§¡¢³ÉÐ͹¤ÒÕ¡¢¸÷ÏòÒìÐԵȣ©Ìá³öÐÞÕýºóµÄ¹¤³Ì°²È«´°¿Ú¡£

\section{ÀíÂÛ»ù´¡£ºË«Á£¾¶»ìºÏÌåϵµÄ¶Ñ»ýÓëÉøÁ÷}
\subsection{»ù±¾¼ÙÉè}
¿¼ÂÇÓÉÁ½ÖÖ¿ÅÁ£×é³ÉµÄ»ìºÏÌåϵ£º
\begin{itemize}
    \item ´ó¿ÅÁ££¨Ôì¿×¼Á£©£¬Ö±¾¶ \(d_{\text{pore}}\)£¬Ìå»ý·ÖÊý \(v_{\text{pore}}\)
    \item С¿ÅÁ££¨»ùÌå·ÛÄ©£©£¬Ö±¾¶ \(d_{\text{alloy}}\)£¬Ìå»ý·ÖÊý \(v_{\text{alloy}} = 1 - v_{\text{pore}}\)
\end{itemize}
¼ÙÉ裺
\begin{enumerate}
    \item Á£¾¶±È \(r = d_{\text{pore}} / d_{\text{alloy}} > 7\)--\(10\)£¬Ð¡¿ÅÁ£¿ÉÓÐЧÌî³ä´ó¿ÅÁ£¼ä϶£»
    \item ´ó¿ÅÁ£ÎªËæ»ú¶Ñ»ý£¬¶Ñ»ýÃÜ¶È \(\rho_{\text{large}}\)£¬¿×϶ÂÊ \(\phi_{\text{void}} = 1 - \rho_{\text{large}}\)£»
    \item С¿ÅÁ£Ìî³äЧÂÊ \(\eta\)£¨\(0 < \eta \le 1\)£©£¬¿¼ÂÇ¿ÅÁ£ÐÎ×´¡¢Á£¾¶±È¡¢»ìºÏ·½Ê½µÈÒòËØ£»
    \item »ìºÏ¾ùÔÈ£¬ÎÞÆ«Îö¡£
\end{enumerate}

\subsection{furnas ¶Ñ»ýÄ£ÐÍÓë¼ä϶Ìî³ä}
furnas£¨1931£©¸ø³öË«Á£¾¶»ìºÏÌåϵµÄ×î´ó¶Ñ»ýÃܶȣº
\begin{equation}
\rho_{\text{mix}} = \rho_{\text{large}} + (1 - \rho_{\text{large}}) \cdot \rho_{\text{small}}.
\end{equation}
´ó¿ÅÁ£µ¥¶À¶Ñ»ýʱ£¬¼ä϶Ìå»ýΪ \(v_{\text{void, pore}} = v_{\text{pore}} \cdot \phi_{\text{void}}\)¡£Êµ¼Ê¿É±»Ð¡¿ÅÁ£Ìî³äµÄÌå»ýΪ£º
\begin{equation}
v_{\text{fill}} = \eta \phi_{\text{void}} v_{\text{pore}}.
\label{eq:fill}
\end{equation}
Ìî³äЧÂÊ \(\eta\) µÄȡֵ·¶Î§£ºÇòÐοÅÁ£¡¢Á£¾¶±È×ã¹»´ó¡¢»ìºÏ³ä·Öʱ \(\eta \approx 0.9\)£»²»¹æÔò¿ÅÁ£¡¢Á£¾¶±È½Ó½üÁÙ½çֵʱ \(\eta \approx 0.6\)--\(0.8\)¡£

\subsection{»ùÌåÁ¬ÐøÐÔÔ¼Êø£¨ÉÏÏÞ£©}
δ±»Çô½ûÔÚÔì¿×¼Á¼ä϶ÖеĻùÌå·ÛÄ©Ìå»ýΪ£º
\begin{equation}
v_{\text{free}} = v_{\text{alloy}} - v_{\text{fill}} = 1 - v_{\text{pore}} - \eta \phi_{\text{void}} v_{\text{pore}} = 1 - v_{\text{pore}}(1 + \eta \phi_{\text{void}}).
\end{equation}
ΪÐγÉÁ¬Ðø³ÐÁ¦ÍøÂ磬ҪÇó×ÔÓÉ»ùÌåÌå»ý´óÓÚÁÙ½çÖµ \(v_{\text{cont}}\)£¨¾­ÑéÈ¡ \(0.20\)£©£º
\begin{equation}
1 - v_{\text{pore}}(1 + \eta \phi_{\text{void}}) > 0.20.
\end{equation}
½âµÃ£º
\begin{equation}
v_{\text{pore}} < \frac{0.8}{1 + \eta \phi_{\text{void}}}.
\label{eq:upper}
\end{equation}
´ËΪ»ùÌåÁ¬ÐøÐÔ¸ø³öµÄÀíÂÛÉÏÏÞ \(v_{\text{pore}}^{\text{max, theo}}\)¡£

\subsection{¿×϶Á¬Í¨ÐÔÔ¼Êø£¨ÏÂÏÞ£©}
Ϊ±£Ö¤Ôì¿×¼ÁÄܱ»ÓÐЧȥ³ý£¨Èܽ⡢·Ö½â£©£¬Ôì¿×¼Á¿ÅÁ£±ØÐëÏ໥Á¬Í¨²¢ÑÓÉìÖÁÑùÆ·±íÃæ¡£ÈýÎ¬Ëæ»ú¶Ñ»ýµÄÇòÐοÅÁ££¬ÉøÁ÷ãÐÖµ \(p_c \approx 0.16\)£¬µ«¿¼ÂÇʵ¼ÊÀ©É¢Í¨µÀÐèÇó£¬È¡ÓÐЧãÐÖµ \(p_c^{\text{eff}}\)£º
\begin{itemize}
    \item ÇòÐÎÔì¿×¼Á£º\(p_c^{\text{eff}} \approx 0.20\)--\(0.25\)
    \item ²»¹æÔòÔì¿×¼Á£¨Àâ½ÇÌṩ¶îÍâÁ¬Í¨Â·¾¶£©£º\(p_c^{\text{eff}} \approx 0.15\)--\(0.20\)
\end{itemize}
Òò´Ë£¬ÀíÂÛÏÂÏÞΪ£º
\begin{equation}
v_{\text{pore}} > p_c^{\text{eff}}.
\label{eq:lower}
\end{equation}

\subsection{ÀíÂÛ°²È«´°¿Ú}
×ÛºÏʽ \eqref{eq:upper} Óë \eqref{eq:lower}£¬µÃÀíÂÛ°²È«´°¿Ú£º
\begin{equation}
p_c^{\text{eff}} < v_{\text{pore}} < \frac{0.8}{1 + \eta \phi_{\text{void}}}.
\label{eq:window_theo}
\end{equation}

\section{¹¤³ÌÔ¼ÊøÏµİ²È«´°¿ÚÐÞÕý}
ÀíÂÛ´°¿Ú½ö¿¼ÂÇÁËÎïÀí¼«ÏÞ£¬Êµ¼Ê¹¤³ÌÖл¹Ð迼ÂÇÒÔÏÂÒòËØ£¬ËüÃÇÍùÍù»á½øÒ»²½ÊÕÕ­°²È«·¶Î§¡£

\subsection{ÉÕ½áÊÕËõÓë³ß´ç¾«¶È}
Ëæ×Å \(v_{\text{pore}}\) Ôö¼Ó£¬ÉúÅ÷ÖлùÌå½Ó´¥Ãæ»ý¼õС£¬ÉÕ½áÇý¶¯Á¦Ôö´ó£¬µ¼ÖÂÏßÐÔÊÕËõÂʿɴï 15\%--25\%£¬ÇÒËæ \(v_{\text{pore}}\) ·ÇÏßÐÔÔö³¤¡£ÎªÂú×ã³ß´ç¹«²î£¬Êµ¼ÊÉÏÏÞÓ¦±£ÁôÔ£¶È£º
\begin{equation}
v_{\text{pore}}^{\text{max, eng}} = \min\left( v_{\text{pore}}^{\text{max, theo}}, \quad v_{\text{shrinkage}}(s_{\text{tol}}) \right),
\end{equation}
ÆäÖÐ \(v_{\text{shrinkage}}\) ÊÇÂú×ã×î´óÔÊÐíÊÕËõÂʵÄÌå»ý·ÖÊýãÐÖµ£¬Í¨³£±ÈÀíÂÛÉÏÏÞµÍ 5\%--10\%¡£

\subsection{Ôì¿×¼ÁÈ¥³ý¶¯Á¦Ñ§ÓëÇúÕÛ¶È}
¼´Ê¹Ôì¿×¼Á¿ÅÁ£ÔÚ¼¸ºÎÉÏÁ¬Í¨£¬ÈôÁ¬Í¨Í¨µÀÇúÕÛ¶È \(\tau\) ¹ý¸ß£¬ÓÐЧÀ©É¢ÏµÊý \(d_{\text{eff}} \propto 1/\tau\) »áÇ÷½üÓÚÁ㣬µ¼ÖÂÖÐÐIJ¿Î»Ôì¿×¼ÁÎÞ·¨ÔÚ¹¤ÒÕʱ¼äÄÚÍêȫȥ³ý¡£Òò´Ë£¬Êµ¼ÊÏÂÏÞÐèÌá¸ß£º
\begin{equation}
v_{\text{pore}}^{\text{min, eng}} = p_c^{\text{eff}} + \delta v_{\text{kinetic}}(l, t_{\text{process}}),
\end{equation}
ÆäÖÐ \(\delta v_{\text{kinetic}}\) ËæÁã¼þºñ¶È \(l\) Ôö¼Ó¶øÔö´ó¡£¶ÔÓÚºñ¶È > 5 mm µÄÁã¼þ£¬½¨Ò齫ÏÂÏÞÌáÉýÖÁ \(0.25\)--\(0.30\)¡£

\subsection{³ÉÐ͹¤ÒÕÐÔÓëÃܶÈÌݶÈ}
ÔÚµ¥ÏòÀäѹÖУ¬¸ß \(v_{\text{pore}}\) ÌåϵѹÁ¦´«µÝЧÂʵͣ¬ÒײúÉúÃܶÈÌݶÈÉõÖÁ²ãÁÑ¡£ÎªÏû³ý´Ë·çÏÕ£¬Èô²ÉÓõ¥ÏòÑ¹ÖÆ£¬½¨ÒéÉÏÏÞ½øÒ»²½½µµÍ£»Èô¸ÄÓÃË«ÏòÑ¹ÖÆ»òÀäµÈ¾²Ñ¹£¬¿ÉÊʵ±·Å¿í¡£

\subsection{½á¹¹¸÷ÏòÒìÐÔ}
²»¹æÔòÔì¿×¼Á£¨Èç nacl Á¢·½Ì壩ÔÚµ¥ÏòѹÁ¦ÏÂÒ×·¢ÉúÈ¡ÏòÅÅÁУ¬µ¼Ö¿×϶½á¹¹¸÷ÏòÒìÐÔ£¬½µµÍ´¹Ö±ÓÚѹÁ¦·½ÏòµÄÇ¿¶È¡£Èô±ØÐëʹÓò»¹æÔòÔì¿×¼ÁÇÒ \(v_{\text{pore}} > 0.30\)£¬½¨Òé²ÉÓõȾ²Ñ¹¹¤ÒÕ£¬»òÔÚÇ¿¶È¼ÆËãÖÐÒýÈë¸÷ÏòÒìÐÔÕÛ¼õϵÊý¡£

\section{¹¤³Ì°²È«´°¿Ú±í´ïʽ}
×ÛºÏÉÏÊöÐÞÕý£¬¹¤³Ì°²È«´°¿ÚΪ£º
\begin{tcolorbox}[colback=red!5!white,colframe=red!75!black,title=¹¤³Ì°²È«´°¿Ú¹«Ê½]
\[
\boxed{
\underbrace{p_c^{\text{eff}} + \delta v_{\text{kinetic}}}_{\text{ʵ¼ÊÏÂÏÞ}}
< v_{\text{pore}} <
\underbrace{\min\left(v_{\text{cont}},\; v_{\text{shrinkage}},\; v_{\text{form}}\right)}_{\text{ʵ¼ÊÉÏÏÞ}}
}
\]
\end{tcolorbox}
ÆäÖУº
\begin{itemize}
    \item \(\delta v_{\text{kinetic}}\)£ºÓÉÁã¼þºñ¶ÈºÍÈ¥³ý¹¤ÒÕ¾ö¶¨µÄ¶¯Á¦Ñ§ÔöÁ¿£¨Í¨³£ \(+0.05\)--\(0.10\)£©£»
    \item \(v_{\text{shrinkage}}\)£ºÓɳߴ繫²î¾ö¶¨µÄÊÕËõÏÞÖÆÖµ£¨Í¨³£±ÈÀíÂÛÉÏÏÞµÍ \(0.05\)£©£»
    \item \(v_{\text{form}}\)£ºÓɳÉÐ͹¤ÒÕ£¨µ¥Ïò/Ë«Ïò/µÈ¾²Ñ¹£©¾ö¶¨µÄÏÞÖÆÖµ¡£
\end{itemize}

\section{Ó¦ÓÃʵÀý£ºalcocrfeni\(_{2.1}\) + nacl Ìåϵ}
\subsection{ÀíÂÛ´°¿Ú¼ÆËã}
nacl Ϊ²»¹æÔòÁ¢·½Ì壬ȡ \(\phi_{\text{void}} \approx 0.45\)£¬\(\eta \approx 0.7\)£¬Ôò£º
\[
v_{\text{pore}}^{\text{max, theo}} = \frac{0.8}{1 + 0.7 \times 0.45} \approx 0.61.
\]
ͬʱ»ùÌåÁ¬ÐøÐÔÒªÇó \(v_{\text{pore}} < 0.61\)£¬µ«¿¼Âǵ½²»¹æÔò¿ÅÁ£Ò×ÐγÉÍøÂ磬¸üÑϸñµÄ¾­ÑéÉÏÏÞΪ \(0.35\)¡£ÏÂÏÞ \(p_c^{\text{eff}} \approx 0.15\)¡£¹ÊÀíÂÛ´°¿ÚԼΪ \(0.15 < v_{\text{pore}} < 0.35\)¡£

\subsection{¹¤³ÌÐÞÕý}
\begin{itemize}
    \item \textbf{ÏÂÏÞÌáÉý}£º¿¼ÂÇ nacl ÈܽâÀ©É¢¼°ºñ±ÚÁã¼þ£¨>5 mm£©£¬È¡ \(\delta v_{\text{kinetic}} = 0.10\)£¬µÃ \(v_{\text{pore}}^{\text{min, eng}} = 0.25\)¡£
    \item \textbf{ÉÏÏÞ½µµÍ}£º¿¼ÂÇÉÕ½áÊÕËõ£¨Ô¤Áô 5\% Ô£¶È£©¼°µ¥ÏòÑ¹ÖÆ·çÏÕ£¬È¡ \(v_{\text{pore}}^{\text{max, eng}} = 0.30\)¡£
\end{itemize}
\subsection{×îÖÕ¹¤³Ì´°¿Ú}
\[
\boxed{0.25 \le v_{\text{pore}} \le 0.30}.
\]
Ô­Ä¿±ê \(v_{\text{pore}} = 0.50\) Ô¶³¬³ö¸Ã´°¿Ú£¬¹ÊÉúÅ÷ËúÏݲ»¿É±ÜÃâ¡£ÈôÐèʵÏÖ 50\% ¿×϶ÂÊ£¬±ØÐë¸ÄÓÃÇòÐÎÔì¿×¼Á£¨Èç pmma£©£¬Æä¹¤³Ì´°¿Ú¿É·Å¿íÖÁ \(0.30 < v_{\text{pore}} < 0.50\)¡£

\section{½áÂÛ}
\begin{enumerate}
    \item »ùÓÚ furnas ¶Ñ»ýÄ£ÐÍÓëÉøÁ÷ÀíÂÛ£¬½¨Á¢ÁËÔì¿×¼ÁÌå»ý·ÖÊýµÄÀíÂÛ°²È«´°¿Ú£º\(p_c^{\text{eff}} < v_{\text{pore}} < \dfrac{0.8}{1 + \eta \phi_{\text{void}}}\)¡£
    \item ¹¤³Ìʵ¼ùÖУ¬ÉÕ½áÊÕËõ¡¢È¥³ý¶¯Á¦Ñ§¡¢³ÉÐ͹¤ÒÕ¼°¸÷ÏòÒìÐÔµÈÒòËØ»á½øÒ»²½ÊÕÕ­¸Ã´°¿Ú£¬ÐèÒýÈë¾­ÑéÐÞÕýÏî¡£
    \item ¶ÔÓÚ alcocrfeni\(_{2.1}\) + nacl Ìåϵ£¬ÍƼö¹¤³Ì´°¿ÚΪ \(0.25 \le v_{\text{pore}} \le 0.30\)£»ÈôÐè¸ü¸ß¿×϶ÂÊ£¬½¨Òé²ÉÓÃÇòÐÎÔì¿×¼Á²¢²ÉÓõȾ²Ñ¹³ÉÐÍ¡£
\end{enumerate}

\begin{thebibliography}{99}
\bibitem{furnas1931} furnas c c. grading aggregates i ¨c mathematical relations for beds of broken solids of maximum density. industrial \& engineering chemistry, 1931, 23(9): 1052¨c1058.
\bibitem{german2014} german r m. powder metallurgy and particulate materials processing. metal powder industries federation, 2014.
\bibitem{sahimi1994} sahimi m. applications of percolation theory. taylor \& francis, 1994.
\end{thebibliography}

\end{document}
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